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CBSE - XII Science - Physics - Moving Charges and Magnetism
PLEASE SOLVE THE POBLEM AND EXPLAIN CLEARLY.
Asked by modi72879
2nd July 2017,
4:43 PM
CBSE - XII Science - Physics - Moving Charges and Magnetism
When current gets divided between galvanometer and shunt resisatance then how can galvonometer measures the original current flowing through the circuit .By using shunt resistance what are we doing in the conversion of galvanometer to ammeter .Pls explain me the whole process ......
Asked by Rzainabafra -
1st July 2016,
9:51 AM
CBSE - XII Science - Physics - Moving Charges and Magnetism
A rectangular coil of sides l and b carrying a current I is subjected to a uniform magnetic field B acting perpendicular to its plane. obtain the expression for the torque acting on it
Asked by Rajeev
21st February 2016,
11:49 PM
CBSE - XII Science - Physics - Moving Charges and Magnetism
- WHAT IS RESTORING TORQUE ?
- WHY IS IT BUILT ?
- HOW IS IT BUILT ?
- WHAT WILL HAPPEN IF IT WILL NOT BUILT ?
Asked by tajalanamdinkarmani4569
12th February 2016,
7:31 PM
CBSE - XII Science - Physics - Moving Charges and Magnetism
Two coils have areas A1 and A2 and carry currents I1 and I2 in clockwise and anti-clockwise directions respectively. They are on the same plane but far from each other What is the magnetic moment of this entire system?
Asked by Aditya Great
3rd June 2015,
9:48 PM
CBSE - XII Science - Physics - Moving Charges and Magnetism
An ammeter of resistance 0.6 Ω can measure current upto 1.0 A. Calculate (i) The shunt resistance required to enable the ammeter to measure current upto 5.0 A (ii) The combined resistance of the ammeter and the shunt.
Asked by Topperlearning User
21st May 2015,
12:53 PM
CBSE - XII Science - Physics - Moving Charges and Magnetism
Write the expression for the magnetic moment 
due to a planar square loop of side 'I' carrying a steady current I in a vector form.
In the given figure this loop is placed in a horizontal plane near a long straight conductor carrying a steady current I1 at a distance I as shown. Give reasons to explain that the loop will experience a net force but no torque. Write the expression for this force acting on the loop.
due to a planar square loop of side 'I' carrying a steady current I in a vector form.
Asked by Topperlearning User
21st May 2015,
10:13 AM
CBSE - XII Science - Physics - Moving Charges and Magnetism
Force acting on a charged particle when it moves in a combined electric and magnetic field is known as Lorentz force. (a) A charged particle is released from rest in a region of steady and uniform electric and magnetic fields; which are parallel to each other. What will be the nature of the path followed by the charged particle? Explain your answer. (b) A rectangular loop carrying a steady current is placed in a uniform magnetic field. Obtain the expression for the torque acting on the loop.
Asked by Topperlearning User
20th May 2015,
3:22 PM
CBSE - XII Science - Physics - Moving Charges and Magnetism
A current loop is considered as a magnetic dipole. Explain.
Asked by Topperlearning User
20th May 2015,
3:06 PM
CBSE - XII Science - Physics - Moving Charges and Magnetism
How the magnetic moment of an electron will change if we double the frequency of its revolution?
Asked by Topperlearning User
20th May 2015,
2:56 PM
CBSE - XII Science - Physics - Moving Charges and Magnetism
What is meant by current sensitivity of a moving coil galvanometer? On what factors does it depend?In an exercise to increase the current sensitivity of a galvanometer by 25%, its resistance is also increased 1.5 time. How will the voltage sensitivity of the meter be affected?
Asked by Topperlearning User
20th May 2015,
2:50 PM
CBSE - XII Science - Physics - Moving Charges and Magnetism
With the help of a neat and labelled diagram, explain the underlying principle and working of a moving coil galvanometer.
Asked by Topperlearning User
20th May 2015,
2:36 PM
CBSE - XII Science - Physics - Moving Charges and Magnetism
State the underlying principle of working of a moving coil galvanometer. Write two reasons why a galvanometer cannot be used as such to measure current in a given circuit. Name any two factors on which the current sensitivity of a galvanometer depends.
Asked by Topperlearning User
20th May 2015,
2:33 PM
CBSE - XII Science - Physics - Moving Charges and Magnetism
A circular coil of 200 turns, radius 5 cm carries a current of 2.5 A. It is suspended vertically in a uniform horizontal magnetic field of 0.25 T, with the plane of the coil making an angle of 60o with the field lines. Calculate the magnitude of the torque that must be applied on it to prevent it from turning.
Asked by Topperlearning User
20th May 2015,
2:14 PM
CBSE - XII Science - Physics - Moving Charges and Magnetism
Derive an expression for the torque acting on a loop of N turns, area A, carrying current i, when held in a uniform magnetic field.
Asked by Topperlearning User
20th May 2015,
2:11 PM
CBSE - XII Science - Physics - Moving Charges and Magnetism
A magnetized needle of magnetic moment 4.6 × 10-2 JT-1 is placed at 30o with the direction of a uniform magnetic field of strength 4 × 10-2 T. a. What is the torque acting on it ?b. How much work is required for it to make a 120o angle with the magnetic field?
Asked by Topperlearning User
20th May 2015,
2:09 PM
CBSE - XII Science - Physics - Moving Charges and Magnetism
A copper wire of density d with cross section area S bent to make three sides of as square can turn about a horizontal axis OO' (FIGURE). The wire is located in uniform vertcal magntic field. Find the magnetic field induction if on passing a current I through the wire the latter deflects by an angle θ .
Asked by Sourav
18th May 2015,
7:57 PM
CBSE - XII Science - Physics - Moving Charges and Magnetism
A cylinder rolls without slipping on a horizontal plane. The radius of curvature is r. Find the curvature radii of trajectories traced out by the points A and B in the figure.
Asked by Sourav
8th May 2015,
12:28 PM
CBSE - XII Science - Physics - Moving Charges and Magnetism
A circular loop of radius a is placed in a diverging magnetic field B such that the angle between the normal to the plane of the loop and field anywhere on the loop is θ. Also, the magnetic field present is such that the lines cut the loop at 900. Derive an expression for the net force exerted by the field on the loop when a current i is made to flow through the loop.
Asked by Topperlearning User
28th April 2015,
2:05 PM
CBSE - XII Science - Physics - Moving Charges and Magnetism
A circular coil of 200 turns and radius 10 cm is placed in a uniform magnetic field of 0.5 T, normal to the plane of the coil. If the current in the coil is 3.0 A, calculate the (a) Total torque on the coil (b) Total force on the coil (c) Average force on each electron in the coil due to the magnetic field Assume the area of cross-section of the wire to be 10-5m2 and the free electron density is 1029/m3.
Asked by Topperlearning User
28th April 2015,
1:54 PM
CBSE - XII Science - Physics - Moving Charges and Magnetism
what is the use of soft iron in the coil of galvanometer??
Asked by Samson Shaji Varghese
17th February 2015,
5:09 PM
CBSE - XII Science - Physics - Moving Charges and Magnetism
What deflection is produced in the galvanometer when there is a relative motion between the coil and the magnet?
Asked by Aditya Great
7th December 2014,
1:14 PM
CBSE - XII Science - Physics - Moving Charges and Magnetism
Is it possible to increase the sensitivity of an instrument?
Asked by Aditya Great
7th December 2014,
1:05 PM
CBSE - XII Science - Physics - Moving Charges and Magnetism
Q1. Increasing the current senstivity of a galvanometer may not necessarily increase the voltage. justify your statement
Asked by poojaparmar065
16th October 2014,
3:05 PM
CBSE - XII Science - Physics - Moving Charges and Magnetism
can you please derive the expression for torque acting on a rectangular current loop in a uniform magnetic field?
Asked by MAANASI.M
22nd September 2014,
11:42 AM
