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MCQs-PYQs-12th-jee

A magnet makes 40 oscillations per minute at a place having magnetic field intensity of 0.1 * 10 ^ – 5 * T At another place, it takes 2.5 sec to complete one vibration. The value of earth’s horizontal field at that place is

MCQs-PYQs-12th-jee

A coil in the shape of an equilateral triangle of side 0.02 m is suspended from its vertex such that it is hanging in a vertical plane between the pole pieces of permanent magnet producing a uniform field of 5 * 10 ^ – 2 * T If a current of 0.1 A is passed through the coil, what is the couple acting

MCQs-PYQs-12th-jee

A frog can be deviated in a magnetic field produced by a current in a vertical solenoid placed below the frog. This is possible because the body of the frog behaves as

MCQs-PYQs-12th-jee

The time period of a freely suspended magnet is 4 seconds. If it is broken in length into two equal parts and one part is suspended in the same way, then its time period will be

MCQs-PYQs-12th-jee

Magnetic permeability is maximum for

MCQs-PYQs-12th-jee

Liquid oxygen remains suspended between two pole faces of a magnet because it is

MCQs-PYQs-12th-jee

The magnetic lines of force inside a bar magnet

MCQs-PYQs-12th-jee

A uniform conducting wire of length 12a and resistance ‘R’ is wound up as a current carrying coil in the shape of, (i) an equilateral triangle of side ‘a’ (ii) a square of side ‘a’ The magnetic dipole moments of the coil in each case respectively are

MCQs-PYQs-12th-jee

Two identical short bar magnets, each having magnetic moment M, are placed a distance of 2d apart with axes perpendicular to each other in a horizontal plane. The magnetic induction at a point midway between them is

MCQs-PYQs-12th-jee

The magnetic field lines due to a bar magnet are correctly shown in

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