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qUESTIONS

MCQs-PYQs-12th-jee

An equilateral triangle is made by uniform wires, AB, BC, CA. A current I enters at A and leaves from the mid point of BC. If the lengths of each side of the triangle is L, the magnetic field B at the centroid O of the triangle is.

MCQs-PYQs-12th-jee

A current i ampere flows in a circular arc of wire whose radius is R, which subtend an angle 3π/2 radian at its centre. The magnetic induction B at the centre is

MCQs-PYQs-12th-jee

A long straight wire carrying current of 30 A is placed in an external uniform magnetic field of 4×10−4T parallel to the current. The magnitude of net magnetic field at point 2 cm away from the wire is

MCQs-PYQs-12th-jee

A wire in the form of a square of side a carries a current i. Then the magnetic induction at the center of the square wire is (Magnetic permeability of free space μ= 0)

MCQs-PYQs-12th-jee

The magnetic field at the center of coil of n turns, bent in the form of a square of side , carrying current i, is

MCQs-PYQs-12th-jee

A wire carrying current I and other carrying 2I in the same direction produce a magnetic field B at the midpoint. What will be the field when 2I wire is switched off?

MCQs-PYQs-12th-jee

A long straight wire carries a current of π amp. The magnetic field due to it will be 5×10-5 weber/m2 at what distance from the wire [μ0= permeability of air]

MCQs-PYQs-12th-jee

Two long straight wires are set parallel to each other. Each carries a current i in the same direction and the separation between them is 2r. The intensity of the magnetic field midway between them is

MCQs-PYQs-12th-jee

A straight wire carries a current vertically upwards. A point P lies to the east of it at a small distance and another point Q lies to the west at the same distance. The magnetic field at P is

MCQs-PYQs-12th-jee

The figure shows the cross-sectional view of the hollow cylindrical conductor with inner radius R and outer radius 2R, cylinder carrying uniformly distributed current I along its axis. The magnetic induction at a point P at distance 3R/2 from the axis of the cylinder will be:

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