MHT CET 2021 23th September Morning Shift | Electromagnetic Induction Question 48 | Physics

At what rate a single conductor should cut the magnetic flux so that current of $$1.5 \mathrm{~mA}$$ flows through it when a resistance of $$5 \Omega$$ is connected across its ends?

$$6 \times 10^{-3} \frac{\mathrm{wb}}{\mathrm{s}}$$

$$8 \times 10^{-3} \frac{\mathrm{wb}}{\mathrm{s}}$$

$$4 \times 10^{-4} \frac{\mathrm{wb}}{\mathrm{s}}$$

$$7.5 \times 10^{-3} \frac{\mathrm{wb}}{\mathrm{s}}$$

MHT CET 2021 22th September Evening Shift

MCQ (Single Correct Answer)

-0

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

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