MHT CET 2021 22th September Evening Shift | Electromagnetic Induction Question 37 | Physics

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

0.8 A

1 A

0.2 A

0.4 A

MHT CET 2021 21th September Morning Shift

MCQ (Single Correct Answer)

-0

The magnetic potential energy stored in a certain inductor is $$25 \mathrm{~mJ}$$, when the current in the inductor is $$50 \mathrm{~mA}$$. This inductor is of inductance

2.00 H

0.20 H

200 H

20 H

MHT CET 2021 21th September Morning Shift

MCQ (Single Correct Answer)

-0

A wire of length '$$L$$'; having resistance '$$R$$' falls from a height '$$\ell$$' in earth's horizontal magnetic field '$$B$$'. The current through the wire is ( $$\mathrm{g}=$$ acceleration due to gravity)

$$\frac{\mathrm{BL} \sqrt{2 \mathrm{~g} \ell}}{\mathrm{R}}$$

$$\frac{\mathrm{BL} \sqrt{2 \mathrm{~g} \ell}}{\mathrm{R}^2}$$

$$\frac{2 \mathrm{BLg} \ell}{\mathrm{R}^2}$$

$$\frac{\mathrm{B}^2 \mathrm{~L}^2}{\mathrm{R}}$$

MHT CET 2021 21th September Morning Shift

MCQ (Single Correct Answer)

-0

A coil of radius '$$\mathrm{r}$$' is placed on another coil (whose radius is '$$\mathrm{R}$$' and current through it is changing) so that their centres coincide. ( $$R > r$$ ). If both coplanar, then the mutual inductance between them is proportional to

$$\frac{R}{r^2}$$

$$\frac{r}{R}$$

$$\frac{R}{r}$$

$$\frac{r^2}{R}$$

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