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qUESTIONS

A wire of a certain material is stretched slowly by ten percent. Its new resistance and specific resistance become respectively [2008]

A wire of resistance R is elongated n-fold to make a new uniform wire. The resistance of new wire [2017]

When a piece of aluminium wire of finite length is drawn through a series of dies to reduce its diameter to half its original value, its resistance will become [2002]

When a wire of uniform cross-section a, length I and resistance R is bent into a complete circle, resistance between any two of diametrically opposite points will be [2005]

MCQs-PYQs-12th-jee

An arrangement of three parallel straight wires placed perpendicular to plane of paper carrying same current i along the same direction is shown in fig. Magnitude of force per unit length on the middle wire ‘B’ is given by

MCQs-PYQs-12th-jee

A bar magnet is hung by a thin cotton thread in a uniform horizontal magnetic field and is in equilibrium state. The energy required to rotate it by 60° is W. Now the torque required to keep the magnet in this new position is

MCQs-PYQs-12th-jee

The equivalent inductance of two inductances is 2.4 henry when connected in parallel and 10 henry when connected in series. The difference between the two inductances is

Three solenoid coils of same dimension, same number of turns and same number of layers of windings are taken. Coil 1 with inductance L was wound using a Mn wire of resistance 11Ω/m, coil 2 with inductance L was wound using the similar wire but the direction of winding was reversed in each layer; coil 3 with inductance L was wound using a superconducting wire. The self inductance of the coils L1,L2,L3 are

MCQs-PYQs-12th-jee

The inductance of a closed-packed coil of 400 turns is 8 mH. A current of 5 mA is passed through it. The magnetic flux through each turn of the coil is

MCQs-PYQs-12th-jee

A circular coil of radius 5 cm has 500 turns of a wire. The approximate value of the coefficient of self induction of the coil will be

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