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qUESTIONS

MCQs-PYQs-12th-jee

A long wire carries a steady current. It is bent into a circle of one turn and the magnetic field at the centre of the coil is B. It is then bent into a circle loop of n turns. The magnetic field at the centre of the coil will be?

MCQs-PYQs-12th-jee

A coil having N turns is wound tightly in the form of a spiral with inner and outer radii a and b respectively. When a current I passes through the coil, the magnetic field at the centre is

MCQs-PYQs-12th-jee

A non-planar loop of conducting wire carrying a current I is placed as shown in the figure. Each of the straight sections of the loop is of length 2a. The magnetic field due to this loop at the point P (a,0,a) points in the direction

MCQs-PYQs-12th-jee

Two identical wires A and B, each of length “l”, carry the same current I. Wire A is bent into a circle of radius R and wire B is bent to form a square of side ′a′. If BA and BB are the values of magnetic field at the centres of the circle and square respectively, then the ratio BA/BB is

MCQs-PYQs-12th-jee

A symmetric star shaped conducting wire loop is carrying a steady state current I as shown in the figure. The distance between the diametrically opposite vertices of the star is 4a. The magnitude of the magnetic field at the center of the loop is

MCQs-PYQs-12th-jee

Wires 1 and 2 carrying currents i1 and i2 respectively are inclined at an angle θ to each other. What is the force on a small element dl of wire 2 at a distance r from wire 1 (as shown in figure) due to the magnetic field of wire 1 ?

MCQs-PYQs-12th-jee

A thin flexible wire of length L is connected to two adjacent fixed points and carries a current I in the clockwise direction as shown in figure. When the system is put in a uniform magnetic field of strength B, going into plane of paper, the tension developed in the wire will be:

A 12 cm wire is given a shape of a right angled triangle ABC having sides 3 cm, 4 cm and 5 cm, as shown in the figure. The resistance between two ends (AB, BC, CA) of the respective sides are measured one by one by a multi-meter. The resistances will be in the ratio [2013]

Two rods are joined end to end, as shown. Both have a cross- sectional area of 0.01 cm². Each is 1 meter long. One rod is of copper with a resistivity of 1.7×10^-6 ohm-centimeter, the other is of iron with a resistivity of 10^-5 ohm-centimeter. How much voltage is required to produce a current of 1 ampere in the rods [2013]

Two metal wires of identical dimension are connected in series. If σ1 and σ2 are the conductivities of the metal wires respectively, the effective conductivity of the combination is [2015]

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