1
MHT CET 2021 23rd September Evening Shift
MCQ (Single Correct Answer)
+1
-0

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]

A
$$3 \times 10^{-6} \mathrm{H}$$
B
$$2 \times 10^{-6} \mathrm{H}$$
C
$$0.5 \times 10^{-6} \mathrm{H}$$
D
$$4 \times 10^{-6} \mathrm{H}$$
2
MHT CET 2021 23rd September Evening Shift
MCQ (Single Correct Answer)
+1
-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

A
$$\frac{\mathrm{IV}}{\mathrm{L}}$$
B
$$\mathrm{L}\left(\frac{\mathrm{V}}{\mathrm{L}}\right)^2$$
C
$$\mathrm{L}\left(\frac{\mathrm{I}}{\mathrm{V}}\right)^2$$
D
$$\frac{\mathrm{LI}}{\mathrm{V}}$$
3
MHT CET 2021 23th September Morning Shift
MCQ (Single Correct Answer)
+1
-0

Eddy currents are produced when

A
a thick metal plate is kept in a steady magnetic field
B
a circular coil is placed in a steady magnetic field
C
a steady current is passed through a coil
D
a thick metal plate is kept in a varying magnetic field
4
MHT CET 2021 23th September Morning Shift
MCQ (Single Correct Answer)
+1
-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

A
3 V
B
16 V
C
10 V
D
7 V
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