JEE 2020 Physics: Self and Mutual Inductance Quiz (11.09.2019) for JEE & BITSAT Exams

Question 1

Lenz’s law determines the direction of flow of current when flux is varied. The Lenz’s law works in accordance to which of the following principle?

Question 2

The circuit shown below consists of a battery and a variable resistance. The resistance is slowly increased. The direction of induced current in loop will be (Neglect mutual inductance)

Question 3

In the given figure a conducting rod is hinged at the middle. Ends are kept on a conducting ring. 2 resistances are connected as shown and the rod is rotated with uniform angular velocity ω. Find current induced in R₁.

Question 4

A parabolic shape wire with equation

is hinged at a point O and is rotated with angular velocity 5 rad/sec in a magnetic field as shown of magnitude 1 Tesla. Find EMF induced in the wire. Given OP = 3m

Question 5

A current carrying wire is kept near a conducting loop with a resistance R and rod of mass m. initially the rod moving with a velocity v. Find external force F required to maintain constant velocity of rod.

Question 6

A ring of radius r, plate and thread system as shown below are in vertical plane. All are conducting. The ring is released from rest and moves down. Assume that ring is always in pure rolling, there is no slipping. Find the final velocity of ring after a long time.

Question 7

A constant force is applied on a conducting rod kept on 2 parallel conducting rails connected by a resistance R. Find current in resistance as a function of time. Initially the rod is in rest at t=0. There is a uniform magnetic field perpendicular to plane of loop pointing inwards.

Question 8

A bar magnet falls with its north pole pointing down through the axis of a copper ring. When viewed from above, the current in the ring will be

Question 9

A coil of resistance 10Ω and inductance of 5H is connected to 100 V battery. Then the energy stored in the coil is

Question 10

An aircraft with a wingspan of 40 m flies with a speed of 1080 km/hr in the eastward direction at a constant altitude in the northern hemisphere, where the vertical component of the earth’s magnetic field 1.75×10^-5 T. Then the emf developed between the tips of the wings is