MHT CET 2021 22th September Evening Shift | Electromagnetic Induction Question 87 | Physics

the magnetic flux (in weber) in a closed circuit of resistance $$20 \Omega$$ varies with time $$t$$ second according to equation $$\phi=5 t^2-6 t+9$$. The magnitude of induced current at $$t=0.2$$ second is

0.8 A

1 A

0.2 A

0.4 A

MHT CET 2021 22th September Morning Shift

MCQ (Single Correct Answer)

-0

A circular coil of radius '$$R$$' has '$$N$$' turns of a wire. The coefficient of self induction of the coil will be ( $$\mu_0=$$ permeability of free space)

$$\frac{\mu_0 N \pi R^2}{2}$$

$$\frac{\mu_0 N \pi R}{4}$$

$$\frac{\mu_0 N^2 \pi R}{2}$$

$$\frac{\mu_0 N \pi R}{2}$$

MHT CET 2021 22th September Morning Shift

MCQ (Single Correct Answer)

-0

A wire of length 1 m is moving at a speed of 2 m/s perpendicular homogenous magnetic field of 0.5 T. The ends of the wire are joined to resistance 6$$\Omega$$. The rate at which work is being done to keep the wire moving at that speed is

$$\frac{1}{3}$$ W

$$\frac{1}{6}$$ W

$$\frac{1}{12}$$ W

1 W

MHT CET 2021 21th September Morning Shift

MCQ (Single Correct Answer)

-0

The magnetic potential energy stored in a certain inductor is $$25 \mathrm{~mJ}$$, when the current in the inductor is $$50 \mathrm{~mA}$$. This inductor is of inductance

2.00 H

0.20 H

200 H

20 H

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