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qUESTIONS

MCQs-PYQs-12th-jee

A long magnetic needle of length 2L, magnetic moment M amd pole strength m units is broken into two pieces at the middle. The magnetic moment amd pole strength of each piece will be

MCQs-PYQs-12th-jee

When a biconvex lens of glass having refractive index 1.47 is dipped in a liquid, it acts as a plane sheet of glass. This implies that the liquid must have refractive index

MCQs-PYQs-12th-jee

Two identical thin bar magnets, each of length L and pole strength m are placed at right angles to each other, with the N-pole of one touching the south pole of the other. Magnetic moment of the system is

MCQs-PYQs-12th-jee

Two magnets, each of magnetic moment ‘M’, are placed so as to form a cross at right angles to each other. The magnetic moment of the system

MCQs-PYQs-12th-jee

Each atom of an iron bar (5cm×1cm×1cm) has a magnetic moment 1.8×10^−23Am2. Knowing that the density of iron is 7.78×10^3kg−3m, atomic weight is 56 and Avogadro’s number is 6.02×10^23 the magnetic moment of bar in the state of magnetic saturation will be

MCQs-PYQs-12th-jee

An iron rod of volume 10−4m3 and relative permeability 1000 is placed inside a long solenoid wound with 5 turns/cm. If a current of 0⋅5A is passed through the solenoid, find the magnetic moment of the rod.

MCQs-PYQs-12th-jee

The speed of light in media M₁ and M2 is 1.5×10 8 m/s and 2.0×108 m/s respectively. A ray of light enters from medium M₁ to M₂ at an incidence angle i. If the ray suffers total internal reflection, the value of i is

MCQs-PYQs-12th-jee

A coil carrying current l has radius r and number of turns n it is rewound so that radius of new coil is r/4 and it carries current l the ratio of magnetic moment of new coil to that of original coil is

MCQs-PYQs-12th-jee

Ratio of magnetic intensities for an axial point and a point on broad side-on position at equal distance d from the centre of magnet will be or The magnetic field at a distance d from a short bar magnet in longitudinal and transverse positions are in the ratio

MCQs-PYQs-12th-jee

Time period of a freely suspended magnet does not depend upon

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