MHT CET 2021 23rd September Evening Shift | Electromagnetic Induction Question 45 | Physics

A circuit has self-inductance 'L' H and carries a current 'I' A. To prevent sparking when the circuit is switched off, a capacitor which can withstand 'V' volt is used. The least capacitance of the capacitor connected across the switch must be equal to

$$\frac{\mathrm{IV}}{\mathrm{L}}$$

$$\mathrm{L}\left(\frac{\mathrm{V}}{\mathrm{L}}\right)^2$$

$$\mathrm{L}\left(\frac{\mathrm{I}}{\mathrm{V}}\right)^2$$

$$\frac{\mathrm{LI}}{\mathrm{V}}$$

MHT CET 2021 23th September Morning Shift

MCQ (Single Correct Answer)

-0

Eddy currents are produced when

a thick metal plate is kept in a steady magnetic field

a circular coil is placed in a steady magnetic field

a steady current is passed through a coil

a thick metal plate is kept in a varying magnetic field

MHT CET 2021 23th September Morning Shift

MCQ (Single Correct Answer)

-0

The magnitude of flux linked with coil varies with time as $$\phi=3 t^2+4 t+7$$. The magnitude of induced e.m.f. at $$t=2 \mathrm{~s}$$ is

3 V

16 V

10 V

7 V

MHT CET 2021 23th September Morning Shift

MCQ (Single Correct Answer)

-0

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?

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

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

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

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

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