1
MHT CET 2021 24th September Morning Shift
+1
-0

A coil has an area $$0.06 \mathrm{~m}^2$$ and it has 600 turns. After placing the coil in a magnetic field of strength $$5 \times 10^{-5} \mathrm{Wbm}^{-2}$$, it is rotated through $$90^{\circ}$$ in 0.2 second. The magnitude of average e.m.f induced in the coil is

$$\left[\cos 0^{\circ}=\sin 90^{\circ}=1 \text { and } \sin 0^{\circ}=\cos 90^{\circ}=0\right]$$

A
$$12 \times 10^{-3} \mathrm{~V}$$
B
$$3 \mathrm{~mV}$$
C
$$3 \mathrm{~V}$$
D
$$9 \times 10^{-3} \mathrm{~V}$$
2
MHT CET 2021 24th September Morning Shift
+1
-0

. If the current of '$$I$$' A gives rise to a magnetic flux '$$\phi$$' through a coil having '$$N$$' turns then mangetic energy stored in the medium surrounding the coil is

A
$$\frac{\mathrm{N} \phi \mathrm{I}}{4}$$
B
$$\frac{\mathrm{N} \phi \mathrm{I}}{2}$$
C
$$\frac{\mathrm{NI}}{2 \phi}$$
D
$$\frac{\mathrm{N} \phi}{2 \mathrm{I}}$$
3
MHT CET 2021 23rd September Evening Shift
+1
-0

A conducting loop of resistance 'R' is moved to magnetic field, the total induced charge depends upon

A
initial magnetic flux and R.
B
final magnetic flux and R.
C
the total change in magnetic flux and R.
D
the rate of change of magnetic flux and $$\mathrm{R}$$.
4
MHT CET 2021 23rd September Evening Shift
+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
$$4 \times 10^{-6} \mathrm{H}$$
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