MHT CET 2021 24th September Morning Shift | Electromagnetic Induction Question 118 | Physics

. 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

$$\frac{\mathrm{N} \phi \mathrm{I}}{4}$$

$$\frac{\mathrm{N} \phi \mathrm{I}}{2}$$

$$\frac{\mathrm{NI}}{2 \phi}$$

$$\frac{\mathrm{N} \phi}{2 \mathrm{I}}$$

MHT CET 2021 23rd September Evening Shift

MCQ (Single Correct Answer)

-0

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

initial magnetic flux and R.

final magnetic flux and R.

the total change in magnetic flux and R.

the rate of change of magnetic flux and $$\mathrm{R}$$.

MHT CET 2021 23rd September Evening Shift

MCQ (Single Correct Answer)

-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]

$$3 \times 10^{-6} \mathrm{H}$$

$$2 \times 10^{-6} \mathrm{H}$$

$$0.5 \times 10^{-6} \mathrm{H}$$

$$4 \times 10^{-6} \mathrm{H}$$

MHT CET 2021 23rd September Evening Shift

MCQ (Single Correct Answer)

-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

$$\frac{\mathrm{IV}}{\mathrm{L}}$$

$$\mathrm{L}\left(\frac{\mathrm{V}}{\mathrm{L}}\right)^2$$

$$\mathrm{L}\left(\frac{\mathrm{I}}{\mathrm{V}}\right)^2$$

$$\frac{\mathrm{LI}}{\mathrm{V}}$$

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