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JEE PHYSICS MCQ: ELECTRO MAGNETIC INDUCTION

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Two coils are placed close to each other. The mutual inductance of the pair of coils depends upon

I. relative position and orientation of the two coils

II. the materials of the wires of the coils

III. the rates at which currents are changing in the two coils

Which of the above statements is/are correct?

View answer and explanation

Correct option: A

I only

Option A is correct because the mutual inductance between two coils depends on their relative position and orientation, affecting the magnetic flux linkage.

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The current in a long solenoid of radius

R

n

turns per unit length is given by

i=i_0 \sin \omega t

. A coil having

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turns is wound around it near the centre. Find the induced emf in the coil. The induced emf can be produced in a coil by

A. moving the coil with uniform speed inside
uniform magnetic field

B. moving the coil with non uniform speed inside
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C. rotating the coil inside the uniform magnetic
field

D. changing the area of the coil inside the uniform
magnetic field

Choose the correct answer from the options given
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4 \mathrm{sec}

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0.1\,\,{m^2}

rotates with a speed of

\mathrm{60}

rps perpendicular to a magnetic field of

\mathrm{0}\mathrm{.4}\,\,\mathrm{T}

\mathrm{100}

turns in the loop, maximum voltage induced in the loop is A

\mathrm{50}\,\,\mathrm{mH}

coil carries a current of

\mathrm{2 A}

, the energy stored in joule is