1
JEE Main 2021 (Online) 26th February Evening Shift
+4
-1
An aeroplane, with its wings spread 10 m, is flying at a speed of 180 km/h in a horizontal direction. The total intensity of earth's field at that part is 2.5 $$\times$$ 10$$-$$4 Wb/m2 and the angle of dip is 60$$^\circ$$. The emf induced between the tips of the plane wings will be __________.
A
88.37 mV
B
62.50 mV
C
54.125 mV
D
108.25 mV
2
JEE Main 2021 (Online) 24th February Evening Shift
+4
-1
Figure shows a circuit that contains four identical resistors with resistance R = 2.0$$\Omega$$, two identical inductors with inductance L = 2.0 mH and an ideal battery with emf E = 9V. The current 'i' just after the switch 'S' is closed will be :

A
3.0 A
B
3.37 A
C
9 A
D
2.25 A
3
JEE Main 2020 (Online) 5th September Evening Slot
+4
-1
An infinitely long, straight wire carrying current I, one side opened rectangular loop and a conductor C with a sliding connector are located in the same plane, as shown, in the figure. The connector has length $$l$$ and resistance R. It slides to the right with a velocity v. The resistance of the conductor and the self inductance of the loop are negligible. The induced current in the loop, as a function of separation r, between the connector and the straight wire is :
A
$${{{\mu _0}} \over {4\pi }}{{Ivl} \over {Rr}}$$
B
$${{{\mu _0}} \over {\pi }}{{Ivl} \over {Rr}}$$
C
$${{{\mu _0}} \over {2\pi }}{{Ivl} \over {Rr}}$$
D
$${{2{\mu _0}} \over \pi }{{Ivl} \over {Rr}}$$
4
JEE Main 2020 (Online) 4th September Morning Slot
+4
-1
A small bar magnet is moved through a coil at constant speed from one end to the other. Which of the following series of observations will be seen on the galvanometer G attached across the coil?
Three positions shown describe :
(a) the magnet's entry
(b) magnet is completely inside and
(c) magnet's exit.
A
B
C
D
EXAM MAP
Medical
NEET