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CBSE - XII Science - Physics - Magnetism and Matter
how bar magnet is equivalent to solenoid
Asked by munaxa013
17th January 2024,
11:56 AM
CBSE - XII Science - Physics - Magnetism and Matter
answer
Asked by akshaygavit07.12dgatl
26th September 2021,
2:01 PM
CBSE - XII Science - Physics - Magnetism and Matter
Two small bar magnet are placed in a line at certain distance d apart if the length of each magnet is negligible comapared to d the force between them is inversely proportional to
Asked by vanshikaklnr
10th September 2020,
5:33 PM
CBSE - XII Science - Physics - Magnetism and Matter
Calculate torque and force acting on the current carrying loop.
Asked by patra04011965
21st June 2020,
8:35 PM
CBSE - XII Science - Physics - Magnetism and Matter
pls solve
Asked by mufeedatvp2000
19th April 2020,
12:01 PM
CBSE - XII Science - Physics - Magnetism and Matter
Why can't the south pole of the magnetic needle deflect in Ampere swimming Rule??
Asked by pratishapranisha153
21st May 2019,
9:45 PM
CBSE - XII Science - Physics - Magnetism and Matter
Find the magnitude and direction
Asked by alanpeter9611
1st March 2019,
12:44 AM
CBSE - XII Science - Physics - Magnetism and Matter
A wire of length l is bent in the form of a circular loop with a no of turns and is suspended in a magnetic field of intensity B. Find the expression for the maximum torque produced on the circular loop when a current I is passed through it.
Asked by mridulabarua05
20th February 2019,
5:08 PM
CBSE - XII Science - Physics - Magnetism and Matter
MUST EVERY MAGNETIC CONFIGURATION HAVE NORTH POLE AND SOUTH POLE AND CAN WE THINK OF MAGNETIC FIELD CONFIGURATION WITH THREE POLES ?
Asked by pardeepkumar2281
6th February 2019,
8:24 PM
CBSE - XII Science - Physics - Magnetism and Matter
A MAGNETISED NEEDLE IN A UNIFORM MAGNETIC FIELD EXPERIENCES A TORQUE BUT NO NET FORCE. HOWEVER, AN IRON NAIL NEAR A BAR MAGNET EXPERIENCES A FORCE OF ATTRACTION IN ADDITION TO TORQUE. EXPLAIN
Asked by pardeepkumar2281
6th February 2019,
8:21 PM
CBSE - XII Science - Physics - Magnetism and Matter
Cyclotron uses
Asked by gowthamig.907
24th January 2019,
2:40 PM
CBSE - XII Science - Physics - Magnetism and Matter
If a proton , deutron and alpha particle are accelerated with same velocity .What is the radius if they enter in a constant magnetic field and, find the ratio of their momentum .
Asked by Ashish
22nd July 2017,
3:05 PM
CBSE - XII Science - Physics - Magnetism and Matter
Please give observations on activities in Practical Physics Subject.(CBSE CLASS 12)
Activities are:
Section A
1. To determine resistance per cm of a given wire by plotting a graph for potential difference versus current.
2. To find resistance of a given wire using metre bridge and hence determine the resistivity (specific resistance) of its material.
3. To verify the laws of combination (series) of resistances using a metre bridge.
Section -B
1. To find the value of v for different values of u in case of a concave mirror and to rind the focal length.
2. To find the focal Length of a convex mirror, using a convex lens.
3. To find the focal Length of a convex lens by plotting graphs between u and v or between 1/u and 1/v.
and 1 experiment To determine refractive index of a glass slab using a travelling microscope.
2. To find resistance of a given wire using metre bridge and hence determine the resistivity (specific resistance) of its material.
3. To verify the laws of combination (series) of resistances using a metre bridge.
Section -B
1. To find the value of v for different values of u in case of a concave mirror and to rind the focal length.
2. To find the focal Length of a convex mirror, using a convex lens.
3. To find the focal Length of a convex lens by plotting graphs between u and v or between 1/u and 1/v.
and 1 experiment To determine refractive index of a glass slab using a travelling microscope.
Asked by sukalp
28th December 2016,
12:23 AM
CBSE - XII Science - Physics - Magnetism and Matter
If the radius of earth where to shrink by 1 percent its mass remains the same, g would decrease by nearly ......%
I took g1(Gravity of original earth)= GM/R^2
g2(after shrinking)= GM/[R-(R/100)]^2
I need help finding g1-g2. I can't get the algebra right. Also need help finding the percentage.
Asked by Deebu
15th September 2016,
2:54 PM
CBSE - XII Science - Physics - Magnetism and Matter
please explain dip angle
Asked by mj369295
22nd January 2016,
10:11 PM
CBSE - XII Science - Physics - Magnetism and Matter
how does a dip circle measures the dip angle at a place?
also explain this statement:
the dip angle in a vertical plane perpendicular to magnetic meridian will 90 degrees.
whyy?
Asked by devanshmalhotra2609
21st January 2016,
6:54 PM
CBSE - XII Science - Physics - Magnetism and Matter
What is the direction of magnetic field at the given position A and why? And direction of current in the disk.
Asked by Today's
16th December 2015,
4:53 PM
CBSE - XII Science - Physics - Magnetism and Matter
Give reasons
a) A charged particle enters a uniform magnetic field in a direction perpendicular to the field always follow circular path ?
Give reasons
a) A charged particle enters a uniform magnetic field in a direction perpendicular to the field always follow circular path ?
Asked by vinitapahel123
13th December 2015,
11:48 AM
CBSE - XII Science - Physics - Magnetism and Matter
What is meant by crossed electric and magnetic fields? Under what condition a charged particle entering a crossed electric and magnetic fields passes undeflected?
Asked by vinitapahel123
12th December 2015,
4:51 PM
CBSE - XII Science - Physics - Magnetism and Matter
An electron is released from the origin at a place where a uniform electric field E and a uniform magnet field B exist along the negative y axis and the negative z axis respectively.Find the displacement of electron along the y axis when its velocity becomes perpendicular to the electric field first time.
Asked by Devesh
15th September 2015,
4:33 PM
CBSE - XII Science - Physics - Magnetism and Matter
The horizontal component of the earth's magnetic field at a place is B and angle of dip is 60o. What is the value of vertical component of earth's magnetic field at equator?
Asked by Topperlearning User
1st June 2015,
3:31 PM
CBSE - XII Science - Physics - Magnetism and Matter
Predict the direction of induced currents in metal rings 1 and 2 lying in the same plane where current I in the wire is increasing steadily.
Asked by Topperlearning User
1st June 2015,
3:31 PM
CBSE - XII Science - Physics - Magnetism and Matter
The vertical component of Earth's magnetic field at a place is 
times the horizontal component. What is the value of angle of dip at this place?
times the horizontal component. What is the value of angle of dip at this place?
Asked by Topperlearning User
1st June 2015,
2:15 PM
CBSE - XII Science - Physics - Magnetism and Matter
(a) Derive the expression for the torque on a rectangular current carrying loop suspended in a uniform magnetic field. (b) A proton and a deuteron having equal momenta enter in a region of uniform magnetic field at right angle to the direction of the field. Depict their trajectories in the field. Or (a) A small compass needle of magnetic moment 'm' is free to turn about an axis perpendicular to the direction of uniform magnetic field 'B'. The moment of inertia of the needle about the axis is 'I'. The needle is slightly disturbed from its stable position and then released. Prove that it executes simple harmonic motion. Hence deduce the expression for its time period. (b) A compass needle, free to a turn in a vertical plane orients itself with its axis vertical at a certain place on the earth. Find out the values of (i) horizontal component of earth's magnetic field and (ii) angle of dip at the place.
Asked by Topperlearning User
1st June 2015,
2:10 PM
CBSE - XII Science - Physics - Magnetism and Matter
A magnetic needle free to rotate in a vertical parallel to the magnetic meridian has its north tip down at 60° with the horizontal. The horizontal component of the earth's magnetic field at the place is known to be 0.4 G. Determine the magnitude of the earth's magnetic field at the place.
Asked by Topperlearning User
1st June 2015,
2:09 PM
CBSE - XII Science - Physics - Magnetism and Matter
If the Earth's existing magnetic field is considered due to a large, circular, current-carrying loop in the Earth's interior, then what is the plane in which the current-carrying loop lies and what is the direction of current in it?
Asked by Topperlearning User
1st June 2015,
1:49 PM
CBSE - XII Science - Physics - Magnetism and Matter
Define a bar magnet and draw its magnetic lines of force.
Asked by Topperlearning User
1st June 2015,
1:47 PM
CBSE - XII Science - Physics - Magnetism and Matter
When a magnet is brought close to iron nails, the nails (streaking to it) rotate as well as translate. Why?
Asked by Topperlearning User
1st June 2015,
1:46 PM
CBSE - XII Science - Physics - Magnetism and Matter
Half of a circular loop of radius 1 m is placed in an external magnetic field of strength 1 T as represented in the given figure. What is the flux linked to the loop?
Asked by Topperlearning User
1st June 2015,
1:43 PM
CBSE - XII Science - Physics - Magnetism and Matter
(i) How can we detect whether an unknown planet has magnetic field or not?(ii) A solenoid of length l, area of cross-section a, and number of tightly wound turns N carries current I. How big will the magnetic field in the solenoid be?
Asked by Topperlearning User
1st June 2015,
1:41 PM
CBSE - XII Science - Physics - Magnetism and Matter
The given figure represents a simple frame of wire carrying current I. Calculate the magnetic field at the centre O.
Asked by Topperlearning User
1st June 2015,
1:39 PM
CBSE - XII Science - Physics - Magnetism and Matter
Explain why magnetic field is circular if current is straight?
Asked by Topperlearning User
1st June 2015,
1:39 PM
CBSE - XII Science - Physics - Magnetism and Matter
A system of two concentric coils of radii 10 cm and 20 cm is placed vertically along the East-West direction as represented in the given figure. The inner coil carries 10 A current in anti-clockwise direction and the outer coil carries 12 A current in clockwise direction. Calculate the net magnetic field with direction at the centre of the concentric coils.
Asked by Topperlearning User
1st June 2015,
1:38 PM
CBSE - XII Science - Physics - Magnetism and Matter
A nickel bar magnet is heated to 500oC and then cooled in free space, which is devoid of any magnetic field. Will the bar retain magnetism?
Asked by Topperlearning User
1st June 2015,
1:35 PM
CBSE - XII Science - Physics - Magnetism and Matter
Given the expression of a magnetic field at a point with position vector , produced because of a current element with current I, and length dl.
Asked by Topperlearning User
21st May 2015,
1:48 PM
CBSE - XII Science - Physics - Magnetism and Matter
The vertical component of the Earth's magnetic field is times the horizontal component at a place. Whit is the angle of dip at that place? If the magnitude of the horizontal component is , then find the resultant field.
Asked by Topperlearning User
21st May 2015,
1:25 PM
CBSE - XII Science - Physics - Magnetism and Matter
If N pole of bar magnet is towards Earth's geographical south pole.Then no. of neutral points is
1.one
2.two
3.four
4.infinite
please tell how to calculate in detail
Asked by Kb Aulakh
20th April 2015,
5:04 PM
CBSE - XII Science - Physics - Magnetism and Matter
DERIVATION OF TORQUE EXPERIENCED BY A CIRCULAR LOOP IN UNIFORM MAGNETIC FIELD?
Asked by ARUN S
3rd March 2015,
4:06 PM
CBSE - XII Science - Physics - Magnetism and Matter
is source of magnetic field analogus to source of electric field
Asked by Anshu Chauhan
19th February 2015,
11:07 PM
CBSE - XII Science - Physics - Magnetism and Matter
1.Que. A horizontal wire of length 0.05m carries a current of 5A.If the mass of the wire is 10mg, the minimum magnetic field required to support the weight of the wire is what?
Asked by Gunjan
14th November 2014,
12:12 PM
CBSE - XII Science - Physics - Magnetism and Matter
a circular coil 5 turns and of 10cm mean diameter is connected avoltage source. if the resisitance is 10 omh , the voltage of the source so as to nullify the horizontal component of earths magnetic field of the horizontal component of earths magnetic field of 30 A turn m^-1 at the centre of the coil should be
Asked by kvunni hj
10th September 2014,
10:15 PM
CBSE - XII Science - Physics - Magnetism and Matter
what is the exact and experimental reason of earth magnetism?
why magnetic monopole is not possible?
why magnetic monopole is not possible?
Asked by Kishujaiswal353
13th August 2014,
5:06 PM
CBSE - XII Science - Physics - Magnetism and Matter
In earth magnetism, are geographic north and magnetic north on same side or on the opposite side??
Asked by Pragyashree Jain
5th August 2014,
12:17 PM
CBSE - XII Science - Physics - Magnetism and Matter
I am asked to make a working model. Please suggest me a good working model.
Asked by shaktiisgreat000
2nd June 2014,
4:09 PM
