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CBSE - XII Science - Physics - Moving Charges and Magnetism
Answer this: Assertion (A): When radius of a circular loop carrying a steady current is doubled, its magnetic moment becomes four times. Reason (R): The magnetic moment of a circular loop carrying a steady current is proportional to the area of the loop. Select the correct answer from the codes (a), (b), (c) and (d) as given belote. (a) Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of the Assertion (A). (b) Both Assertion (A) and Reason (R) are true, but Reason (R) is not the correct explanation of the Assertion (A). (c) Assertion (A) is true, but Reason (R) is false. (d) Assertion (A) is false and Reason (R) is also false.
Asked by anubhutiupadhaya
6th March 2023,
4:23 PM
CBSE - XII Science - Physics - Moving Charges and Magnetism
PLEASE SOLVE IT
Asked by rd0543293
19th June 2022,
10:51 AM
CBSE - XII Science - Physics - Moving Charges and Magnetism
Please refer to the uploaded image for the doubt
Asked by arjunsah797
16th March 2022,
2:07 PM
CBSE - XII Science - Physics - Moving Charges and Magnetism
Sir Pl solve questions no 18
Asked by shobhit
29th March 2019,
10:54 PM
CBSE - XII Science - Physics - Moving Charges and Magnetism
Kindly answer the question.
Asked by rajuharan
30th August 2016,
12:44 PM
CBSE - XII Science - Physics - Moving Charges and Magnetism
GIVE THE DETAILED DESCRIPTION ABOUT TANGENT GALVANOMETER
sir/mam
i dont know anything about it ,
please... along with definition ,add some more points that can add up my marks..
Asked by preethambasilmartis
21st June 2016,
4:26 PM
CBSE - XII Science - Physics - Moving Charges and Magnetism
a wire of density d and cross sectional area A fors three sides of a square and is free to rotate about one of its horizontal sides.A magnetic field B exists in the vertically upward direction. When a current i is passed through the wire, the system comes to rest at an angle X to the vertical. then the value of X is given by
1.cosX=2Adg/iB
2.cotX=2Adg/iB
3.tanX=Adg/2iB
4.sinX=Adg/2iB
Asked by Sunil Soni
7th May 2016,
11:57 PM
CBSE - XII Science - Physics - Moving Charges and Magnetism
Is the steady electric current the only source of magnetic field .give reason
Asked by Rajeev
21st February 2016,
11:43 PM
CBSE - XII Science - Physics - Moving Charges and Magnetism
Two parallel wires carry equal current of 10A along same direction and are separated by a distance of 2 cm. Find the magnetic field at a point 2 cm away from each of these wires?
Asked by Tanya raj
21st August 2015,
8:23 PM
CBSE - XII Science - Physics - Moving Charges and Magnetism
Draw a labelled diagram of a moving coil galvanometer. State the principle on which it works. Deduce an expression for the torque acting on a rectangular current carrying loop kept in a uniform magnetic field.Write two factors on which the current sensitivity of a moving coil galvanometer depends. Or State Biot-Savart law.Use it to derive an expression for the magnetic field at the centre of a circular loop of radius R carrying a steady current I.Sketch the magnetic field lines for such a current carrying loop.
Asked by Topperlearning User
21st May 2015,
12:59 PM
CBSE - XII Science - Physics - Moving Charges and Magnetism
With the help of a neat and labeled diagram, explain the underlying principle and working of a moving coil galvanometer. What is the function of: (i) uniform radial field (ii) soft iron core in such a device? OR Derive a mathematical expression for the force per unit length experienced by each of the two long current carrying conductors placed parallel to each other in air. Hence define one ampere of current. Explain why two parallel straight conductors carrying current in the opposite direction kept near each other in air repel?
Asked by Topperlearning User
21st May 2015,
12:55 PM
CBSE - XII Science - Physics - Moving Charges and Magnetism
A long straight wire of a circular cross-section of radius 'a' carries a steady current 'I'. The current is uniformly distributed across the cross-section. Apply Ampere's circuital law to calculate the magnetic field at point 'r' in the region for (i) r < a and (ii) r > a OR State the underlying principle of working of a moving coil galvanometer. Write two reasons why a galvanometer can not 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
21st May 2015,
10:50 AM
CBSE - XII Science - Physics - Moving Charges and Magnetism
You are given a low resistance R1, a high resistance R2 and a moving coil galvanometer. Suggest how would you use these to have an instrument that will be able to measure (i) current (ii) potential difference.
Asked by Topperlearning User
21st May 2015,
9:57 AM
CBSE - XII Science - Physics - Moving Charges and Magnetism
The velocities of two particles A and B entering a uniform electric field are in the ratio 4:1. On entering the field they move in different circular paths. Give the ratio of the radii of curvature of the paths of the particles. OR You are given a low resistance R1, a high resistance R2 and a moving coil galvanometer. Suggest how would you use these to have an instrument that will be able to measure (i) current (ii) potential difference.
Asked by Topperlearning User
21st May 2015,
9:56 AM
CBSE - XII Science - Physics - Moving Charges and Magnetism
State two properties of the material of wire used for suspension of coil in a moving coil galvanometer.
Asked by Topperlearning User
20th May 2015,
3:15 PM
CBSE - XII Science - Physics - Moving Charges and Magnetism
Explain why two long parallel straight conductors carrying current in opposite direction in air repel. OR State two reasons why a galvanometer can not be used as such to measure current in a given circuit.
Asked by Topperlearning User
20th May 2015,
3:09 PM
CBSE - XII Science - Physics - Moving Charges and Magnetism
A rectangular loop of sides 25 cm and 10 cm carrying a current of 15 A is placed with its longer side parallel to a long straight conductor 2.0 cm apart carrying a current of 25 A(fig). What is the net force on the loop ?
Asked by Topperlearning User
20th May 2015,
3:09 PM
CBSE - XII Science - Physics - Moving Charges and Magnetism
State two reasons why a galvanometer can not be used as such to measure current in a given circuit.
Asked by Topperlearning User
20th May 2015,
3:05 PM
CBSE - XII Science - Physics - Moving Charges and Magnetism
Explain why two straight parallel conductor carrying current in same direction attract each other.
Asked by Topperlearning User
20th May 2015,
3:03 PM
CBSE - XII Science - Physics - Moving Charges and Magnetism
What will happen if we keep two current carrying conductors parallel with current flowing in opposite direction?
Asked by Topperlearning User
20th May 2015,
2:06 PM
CBSE - XII Science - Physics - Moving Charges and Magnetism
Two conductors placed at a distance of 12 cm are parallel to each other and attract with a force of 10 N. If the current in one conductor is 5 A, find the current in other conductor.
Asked by Topperlearning User
20th May 2015,
1:47 PM
CBSE - XII Science - Physics - Moving Charges and Magnetism
A long straight conductor AB carries a current of 50 A and is fixed horizontally. Conductor CD lies parallel to AB at a distance of 5 cm in air. If CD carries a current I, calculate its magnitude of which it balances the weight of the conductor CD (Considering mass per unit length for conductor CD is 10-2 kg/m)
Asked by Topperlearning User
20th May 2015,
1:43 PM
CBSE - XII Science - Physics - Moving Charges and Magnetism
A rectangular loop of sides 20 cm × 10 cm carries a current of 10 A. Suppose the longer side of the rectangle is placed parallel at a distance of 5 cm to a conductor carrying 15 A current.
Asked by Topperlearning User
20th May 2015,
1:38 PM
CBSE - XII Science - Physics - Moving Charges and Magnetism
If two long parallel wires are suspended freely. What would be the effect if they are connected to a battery a) In series b) In parallel
Asked by Topperlearning User
20th May 2015,
1:33 PM
CBSE - XII Science - Physics - Moving Charges and Magnetism
Two charges 5 C and 8 C separated by a distance of 10 cm are moving with velocity 15 m/s and 20 m/s respectively. What is the magnitude of force acting between these two charges?
Asked by Topperlearning User
20th May 2015,
1:31 PM
CBSE - XII Science - Physics - Moving Charges and Magnetism
Two wires carrying equal and opposite current are twisted together to reduce magnetic effect. What is the basis for this procedure?
Asked by Topperlearning User
20th May 2015,
10:29 AM
CBSE - XII Science - Physics - Moving Charges and Magnetism
Two infinitely long parallel conductors carrying current in the same direction tend to attract each other. Derive the expression for the force per unit length.
Asked by Topperlearning User
20th May 2015,
10:28 AM
CBSE - XII Science - Physics - Moving Charges and Magnetism
Two long parallel straight wires M and N separated by a distance 8 cm in the air carry currents 10 A and 12 A in opposite direction. Calculate the magnitude and direction of the force on a 22 cm length of wire N.
Asked by Topperlearning User
20th May 2015,
10:27 AM
CBSE - XII Science - Physics - Moving Charges and Magnetism
What will happen if two linear current carrying conductors of unequal length are held parallel to each other?
Asked by Topperlearning User
20th May 2015,
10:25 AM
CBSE - XII Science - Physics - Moving Charges and Magnetism
define one ampere of current using the concept of force between two parallel current carrying conductors .
Asked by Manisha Behera
20th February 2015,
7:19 AM
CBSE - XII Science - Physics - Moving Charges and Magnetism
If two protons are travelling in same direction parallel to each other, then what would be the nature of force? Attraction or repulsion and why??
Asked by Pragyashree Jain
21st July 2014,
10:43 AM
