1
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
$$\frac{\mathrm{N} \phi}{2 \mathrm{I}}$$
2
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 $$\mathrm{R}$$.
3
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
$$4 \times 10^{-6} \mathrm{H}$$
4
MHT CET 2021 23rd September Evening Shift
+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
$$\frac{\mathrm{LI}}{\mathrm{V}}$$
EXAM MAP
Medical
NEET