1
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
$$\frac{\mathrm{LI}}{\mathrm{V}}$$
2
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
3
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
4
MHT CET 2021 23th September Morning Shift
MCQ (Single Correct Answer)
+1
-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?

A
$$6 \times 10^{-3} \frac{\mathrm{wb}}{\mathrm{s}}$$
B
$$8 \times 10^{-3} \frac{\mathrm{wb}}{\mathrm{s}}$$
C
$$4 \times 10^{-4} \frac{\mathrm{wb}}{\mathrm{s}}$$
D
$$7.5 \times 10^{-3} \frac{\mathrm{wb}}{\mathrm{s}}$$
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