1
MHT CET 2021 22th September Morning Shift
MCQ (Single Correct Answer)
+1
-0

A wire of length 1 m is moving at a speed of 2 m/s perpendicular homogenous magnetic field of 0.5 T. The ends of the wire are joined to resistance 6$$\Omega$$. The rate at which work is being done to keep the wire moving at that speed is

A
$$\frac{1}{3}$$ W
B
$$\frac{1}{6}$$ W
C
$$\frac{1}{12}$$ W
D
1 W
2
MHT CET 2021 21th September Morning Shift
MCQ (Single Correct Answer)
+1
-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

A
2.00 H
B
0.20 H
C
200 H
D
20 H
3
MHT CET 2021 21th September Morning Shift
MCQ (Single Correct Answer)
+1
-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)

A
$$\frac{\mathrm{BL} \sqrt{2 \mathrm{~g} \ell}}{\mathrm{R}}$$
B
$$\frac{\mathrm{BL} \sqrt{2 \mathrm{~g} \ell}}{\mathrm{R}^2}$$
C
$$\frac{2 \mathrm{BLg} \ell}{\mathrm{R}^2}$$
D
$$\frac{\mathrm{B}^2 \mathrm{~L}^2}{\mathrm{R}}$$
4
MHT CET 2021 21th September Morning Shift
MCQ (Single Correct Answer)
+1
-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

A
$$\frac{R}{r^2}$$
B
$$\frac{r}{R}$$
C
$$\frac{R}{r}$$
D
$$\frac{r^2}{R}$$
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