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qUESTIONS

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 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

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

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:

MCQs-PYQs-12th-jee

A current loop consists of two identical semicircular parts each of radius R, one lying in the .x-y plane and the other in x-z plane. If the current in the loop is i. The resultant magnetic field due to the two semicircular parts at their common centre is

MCQs-PYQs-12th-jee

A wire carrying current `I` has the shape as shown in the adjoining figure. Linear parts of the wire are very long and parallel to X-axis while semicicular portion of radius `R` is lying in `Y-Z` plane. Magnetic field at point `O` is

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