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qUESTIONS

MCQs-PYQs-12th-jee

A bar magnet is held perpendicular to a uniform magnetic field. If the couple acting on the magnet is to be halved by rotating it, then the angle by which it is to be rotated is[2000]

MCQs-PYQs-12th-jee

Three coplanar, parallel, long straight wires are equally spaced, that is, the distance between each pair of successive wires is the same. the first and the third wire carry currents of 1 a each, in the same direction. what must be the current in the second wire (wire in the middle), so that the other two wires do not feel any net force?

MCQs-PYQs-12th-jee

Three long straight wires are connected parallel to each other across a battery of negligible internal resistance. The ratio of their resistances are 3 : 4 : 5. What is the ratio of distances of middle wire from the others if the net force experienced by it is zero

MCQs-PYQs-12th-jee

Two infinitely long parallel wires carry currents of magnitude I1 and I2 and are at a distance 4 cm apart. The magnitude of the net magnetic field is found to reach a non-zero minimum values between the two wires and 1 cm away from the first wire. The ratio of the two currents and their mutual direction is

MCQs-PYQs-12th-jee

A current carrying straight wire is kept along the axis of a circular loop carrying a current. The straight wire

MCQs-PYQs-12th-jee

Uniform magnetic field B is directed vertically upwards and 3 wires of equal length L, carrying equal current I are lying in a horizontal plane such that the first one is along north, second one along north-east and the third one at 60∘ north of east. Force exerted by magnetic field B on them is

MCQs-PYQs-12th-jee

A current of 5 ampere is flowing in a wire of length 1.5 metres. A force of 7.5N acts on it when it is placed in a uniform magnetic field of 2 Tesla. The angle between the magnetic field and the direction of the current is

MCQs-PYQs-12th-jee

A power line lies along the east-west direction and carries a current of 10 ampere . The force per metre due to the earth’s magnetic field of 10^−4 tesla is

MCQs-PYQs-12th-jee

A conducting rod of 1 meter length and 1 kg mass is suspended by two vertical wires through its ends. An external magnetic field of 2 Tesla is applied normal to the rod. Now the current to be passed through the rod so as to make the tension in the wires zero is [take g = 10 ms–2]

MCQs-PYQs-12th-jee

If a long hollow copper pipe carries a direct current, the magnetic field associated with the current will be

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