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qUESTIONS

MCQs-PYQs-12th-jee

A beam of well collimated cathode rays travelling with a speed of 5×10−6ms−1 enters a region of mutually perpendicular electric and magnetic fields and emerge undeviated from this region. If |B| = 0.02T , the magnitude of the electric field is

MCQs-PYQs-12th-jee

A proton (or charged particular) moving with velocity ν is acted upon by electric field E and magnetic field B. The proton will move undeflected if

MCQs-PYQs-12th-jee

A strong magnetic field is applied on a stationary electron. Then

MCQs-PYQs-12th-jee

A 2μC charge moving around a circle with a frequency of 6.25×1012Hz produces a magnetic field 6.28T at the centre of the circle. The radius of the circle is

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?

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