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qUESTIONS

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

MCQs-PYQs-12th-jee

A long straight wire of radius a carries a steady current I. The current is uniformly distributed over its cross-section. The ratio of the magnetic fields B and B’ , at radial distances a/2 and 2a respectively from the axis of the wire is:

If three bulbs 60 W, 100 W and 200 W are connected in parallel, then

In the circuit shown below, the power developed in the 6Ω resistor is 6 watt. The power in watts developed in the 4Ω resistor is

If two electric bulbs have 40 W and 60 W rating at 220 V, then the ratio of their resistances will be

An electric bulb rated 220 V, 100 W is connected in series with another bulb rated 220 V, 60 W. If the voltage across the combination is 220 V, the power consumed by the 100 W bulb will be about

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