NEET UG PHYSICS MCQ: ELECTRO MAGNETIC INDUCTION

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An ideal capacitor of capacitance

0.2\mu F

is charged to a potential difference 10V. The charging battery is then disconnected. The capacitor is then connected to an ideal number of self inductance 0.5mH. The current at a time when the potential difference across the capacitor is 5V, is

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Correct option: A

0.17\mathrm{ }A

Option A (

0.17\mathrm{ }A

) is correct because it is calculated using the conservation of energy principle in an LC circuit, where the initial energy stored in the capacitor is equal to the sum of the energy stored in the capacitor and the inductor at any given time.

More Questions from ELECTRO MAGNETIC INDUCTION

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Assertion (A): Whenever the magnetic flux linked with a closed coil changes there will be an induced emf as well as an induced current.

Reason (R): According to Faraday, the induced emf is inversely proportional to the rate of change of magnetic flux linked with a coil. The coefficient of mutual inductance of two coils is

6\,\,mH

. If the current flowing in one is

2\,\,ampere

, then the induced e.m.f. in the second coil will be The induced emf cannot be produced by: Consider the statements:
(I)If magnetic field,

\mathrm{B = 0}

, then magnetic flux is also zero.
(II)If magnetic flux,

\phi = 0,

then magnetic field is also zero. The coefficient of self inductance of a solenoid is 0.18 mH. If a rod of soft iron of relative permeability 900 is inserted, then the coefficient of self inductance (in mH ) will become nearly: A uniformly wound solenoidal coil of self inductance

1.8 \times {10^{ - 4}}

H and resistance 6 Ω is broken up into two identical coils. These identical coils are then connected in parallel across a 12 V battery of negligible resistance. The time constant of the current in the circuit 