1
JEE Main 2022 (Online) 25th July Morning Shift
+4
-1

A small square loop of wire of side $$l$$ is placed inside a large square loop of wire $$\mathrm{L}(\mathrm{L}>>l)$$. Both loops are coplanar and their centres coincide at point $$\mathrm{O}$$ as shown in figure. The mutual inductance of the system is :

A
$$\frac{2 \sqrt{2} \mu_{0} \mathrm{~L}^{2}}{\pi l}$$
B
$$\frac{\mu_{0} l^{2}}{2 \sqrt{2} \pi \mathrm{L}}$$
C
$$\frac{2 \sqrt{2} \mu_{0} l^{2}}{\pi \mathrm{L}}$$
D
$$\frac{\mu_{0} \mathrm{~L}^{2}}{2 \sqrt{2} \pi l}$$
2
JEE Main 2022 (Online) 28th June Evening Shift
+4
-1

A coil is placed in a time varying magnetic field. If the number of turns in the coil were to be halved and the radius of wire doubled, the electrical power dissipated due to the current induced in the coil would be :

(Assume the coil to be short circuited.)

A
Halved
B
C
The same
D
Doubled
3
JEE Main 2022 (Online) 26th June Evening Shift
+4
-1

Two coils of self inductance L1 and L2 are connected in series combination having mutual inductance of the coils as M. The equivalent self inductance of the combination will be :

A
$${1 \over {{L_1}}} + {1 \over {{L_2}}} + {1 \over M}$$
B
$${L_1} + {L_2} + M$$
C
$${L_1} + {L_2} + 2M$$
D
$${L_1} + {L_2} - 2M$$
4
JEE Main 2022 (Online) 26th June Evening Shift
+4
-1

A metallic conductor of length 1 m rotates in a vertical plane parallel to east-west direction about one of its end with angular velocity 5 rad s$$-$$1. If the horizontal component of earth's magnetic field is 0.2 $$\times$$ 10$$-$$4 T, then emf induced between the two ends of the conductor is :

A
5 $$\mu$$V
B
50 $$\mu$$V
C
5 mV
D
50 mv
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