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JEE PHYSICS MCQ: ELECTRO MAGNETIC INDUCTION

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Assertion: Unlike charges are projected in opposite direction in transverse magnetic field, then they are deflected in same direction.

Reason: If a voltmeter connected across two peripheral points of faraday copper disc generator, its reading is zero.

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Correct option: B

If both Assertion & Reason are True but Reason is not a correct explanation of the Assertion.

Option B is correct because both the assertion and reason are true, but the reason does not explain the assertion. The deflection direction depends on the charge sign, and the voltmeter reading is zero due to Faraday's law.

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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

N

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
uniform magnetic field

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
below: An inductance coil have the time constant

4 \mathrm{sec}

, if it is cut into two equal parts and connected parallel then new time constant of the circuit- If the coils of a transformer are made up of thick wire, then A loop of area

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