1

JEE Main 2019 (Online) 8th April Morning Slot

MCQ (Single Correct Answer)

+4

-1

A 20 Henry inductor coil is connected to a
10 ohm resistance in series as shown in figure.
The time at which rate of dissipation of energy
(joule's heat) across resistance is equal to the
rate at which magnetic energy is stored in the
inductor is :

2

JEE Main 2019 (Online) 12th January Evening Slot

MCQ (Single Correct Answer)

+4

-1

A 10 m long horizontal wire extends from North East to South West. It is falling with a speed of 5.0 ms

^{–1}, at right angles to the horizontal component of the earth's magnetic field of 0.3 $$ \times $$ 10^{–4}^{}Wb/m^{2}. The value of the induced emf in wire is :3

JEE Main 2019 (Online) 11th January Evening Slot

MCQ (Single Correct Answer)

+4

-1

A copper wire is wound on a wooden frame, whose shape is that of an equilateral triangle. If the linear
dimension of each side of the frame is increased by a factor of 3, keeping the number of turns of the coil per
unit length of the frame the same, then the self inductance of the coil:

4

JEE Main 2019 (Online) 11th January Morning Slot

MCQ (Single Correct Answer)

+4

-1

There are two long co-axial solenoids of same length $$l$$. The inner and outer coils have radii r

_{1}and r_{2}and number of turns per unit length n_{1}and n_{2}, respectively. The ratio of mutual inductance to the self - inductance of the inner-coil is :Questions Asked from Electromagnetic Induction (MCQ (Single Correct Answer))

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