1
MHT CET 2021 23th September Morning Shift
+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
2
MHT CET 2021 23th September Morning Shift
+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
$$7.5 \times 10^{-3} \frac{\mathrm{wb}}{\mathrm{s}}$$
3
MHT CET 2021 22th September Evening Shift
+1
-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

A
0.8 A
B
1 A
C
0.2 A
D
0.4 A
4
MHT CET 2021 22th September Morning Shift
+1
-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)

A
$$\frac{\mu_0 N \pi R^2}{2}$$
B
$$\frac{\mu_0 N \pi R}{4}$$
C
$$\frac{\mu_0 N^2 \pi R}{2}$$
D
$$\frac{\mu_0 N \pi R}{2}$$
EXAM MAP
Medical
NEET