MHT CET 2021 23rd September Evening Shift | Electromagnetic Induction Question 44 | Physics

The self inductance of solenoid of length $$31.4 \mathrm{~cm}$$, area of cross section $$10^{-3} \mathrm{~m}^2$$ having total number of turns 500 will be nearly [$$\mu_0=4 \pi \times 10^{-7}$$ SI unit]

$$3 \times 10^{-6} \mathrm{H}$$

$$2 \times 10^{-6} \mathrm{H}$$

$$0.5 \times 10^{-6} \mathrm{H}$$

$$4 \times 10^{-6} \mathrm{H}$$

MHT CET 2021 23rd September Evening Shift

MCQ (Single Correct Answer)

-0

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

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