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qUESTIONS

MCQs-PYQs-12th-jee

A rectangular loop of wire shown below is coplanar with a long wire carrying current 1. The loop is pulled to the right as indicated. What are the directions of the induced current in the loop and the magnetic forces on the left and the right sides of the loop Induced current Forces on left side Force on right side

MCQs-PYQs-12th-jee

The current carrying wire and the rod AB are in the same plane. The rod moves parallel to the wire with a velocity v. Which one of the following statements is true about induced emf in the rod

MCQs-PYQs-12th-jee

A straight conductor of length 4 m moves at a speed of 10 m/s. When the conductor makes an angle of 30° with the direction of magnetic field of induction of 0.1 Wb. m’ then induced emf is

MCQs-PYQs-12th-jee

At a place the value of the horizontal component of the earth’s magnetic field H is 3×10-5 weber/m2. A metallic rod AB of length 2 m placed in east-west direction, having the end A towards east, falls vertically downward with a constant velocity of 50 m/s2. Which end of the rod becomes positively charged and what is the value of induced potential difference between the two ends

MCQs-PYQs-12th-jee

A wire of length 1 m is moving at a speed of 2 ms-1 perpendicular to its length and in a homogeneous magnetic field of 0.5 T. The ends of the wire are joined to a circuit of resistance 6Ω. The rate at which work is being done to keep the wire moving at constant speed is

MCQs-PYQs-12th-jee

If a coil of metal wire is kept stationary in a non-uniform magnetic field, then

A group of N cells whose emf varies directly with the internal resistance as per the equation EN = 1.5 rn are connected as shown in the figure below. The current I in the circuit is

A primary cell has an e.m.f. of 1.5 volt, when short-circuited it gives a current of 3 ampere. The internal resistance of the cell is

In Wheatstone’s bridge P = 9 ohm, Q=11ohm, R = 4 ohm and S = 6 ohm. How much resistance must be put in parallel to the resistance S to balance the bridge

AB is a wire of uniform resistance. The galvanometer G shows no current when the length AC = 20 cm and CB = 80 cm. The resistance R is equal to

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