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CBSE Class 12-science Answered

PLEASE SOLVE THE POBLEM AND EXPLAIN CLEARLY.
Asked by modi72879 | 02 Jul, 2017, 04:43: PM
answered-by-expert Expert Answer
begin mathsize 12px style Let space the space magnetic space moment space of space the space circular space coil space be space straight M subscript straight C space and space that space of space square space coil space be space straight M subscript straight S. Taking space the space ratio space of space magnetic space moments space of space the space two comma space we space get straight M subscript straight S over straight M subscript straight C space equals space fraction numerator 2 INA subscript straight S over denominator INA subscript straight C end fraction GIven space that space the space current space straight I space and space the space number space of space turns space straight N space remains space the space same. space space space space space space space equals space space fraction numerator 2 space cross times space straight pi open parentheses begin display style straight R over 2 end style close parentheses squared over denominator πR squared end fraction rightwards arrow straight M subscript straight S over straight M subscript straight C space equals space 1 half end style
Answered by Yashvanti Jain | 03 Jul, 2017, 10:39: AM

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CBSE 12-science - Physics
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 | 20 May, 2015, 02:09: PM
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CBSE 12-science - Physics
  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 | 28 Apr, 2015, 02:05: PM
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CBSE 12-science - Physics
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 | 20 May, 2015, 02:11: PM
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CBSE 12-science - Physics
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 | 20 May, 2015, 02:14: PM
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CBSE 12-science - Physics
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 | 20 May, 2015, 02:33: PM
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CBSE 12-science - Physics
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 | 28 Apr, 2015, 01:54: PM
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CBSE 12-science - Physics
With the help of a neat and labelled diagram, explain the underlying principle and working of a moving coil galvanometer.
Asked by Topperlearning User | 20 May, 2015, 02:36: PM
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CBSE 12-science - Physics
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 | 20 May, 2015, 02:50: PM
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CBSE 12-science - Physics
How  the magnetic moment of an electron  will change if we double the frequency of its revolution?
Asked by Topperlearning User | 20 May, 2015, 02:56: PM
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CBSE 12-science - Physics
A current loop is considered as a magnetic dipole. Explain.
Asked by Topperlearning User | 20 May, 2015, 03:06: PM
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