1

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 :2

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:

3

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 :4

JEE Main 2019 (Online) 10th January Evening Slot

MCQ (Single Correct Answer)

+4

-1

The self induced emf of a coil is 25 volts. When the current in it is changed at uniform rate from 10 A to 25 A in 1s, the change in the energy of the inductance is -

Questions Asked from Electromagnetic Induction (MCQ (Single Correct Answer))

Number in Brackets after Paper Indicates No. of Questions

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