Concepts Of Physics MCQ Edition [Volume 2]PhysicsPermanent Magnets

Choose the correct statements.

Options

AA north pole corresponds to a clockwise current, and a south pole corresponds to an anticlockwise current.
BMagnetic poles are merely mathematical assumptions that have no physical existence.
CA bar magnet is equivalent to a long, straight current.
DA magnetic field is produced solely by electric charges.

Correct answer

B. Magnetic poles are merely mathematical assumptions that have no physical existence.

Step-by-step solution

Statement (1) is incorrect. According to the clock rule, an anticlockwise current acts as a North pole, and a clockwise current acts as a South pole. Statement (2) is correct. Isolated magnetic poles (magnetic monopoles) do not exist in nature. They are merely mathematical assumptions used to simplify the description and calculation of magnetic fields. Statement (3) is incorrect. A bar magnet is equivalent to a current-carrying solenoid, not a long, straight wire. Statement (4) is incorrect. A magnetic field is pro

Practice Permanent Magnets on Quantrex Academy →

More from Permanent Magnets

The magnetic field at a point situated 10 cm from a magnetic dipole is observed to be 2.0 10⁻⁴ T . Calculate the magnetic moment of the dipole if this point is located in the broad The magnetic field at a point due to a magnetic dipole is perpendicular to the magnetic axis. Find the angle that the line joining the point with the centre of the dipole makes wit Two long bar magnets are positioned such that their axes coincide and the north pole of the first magnet is located 2.0 cm away from the south pole of the second. Given that both m A long bar magnet possesses a pole strength of 10 Am . Determine the magnetic field at a point situated on the magnet's axis, at a distance of 5 cm from its north pole.A magnetic dipole having a magnetic moment of 1.44 A m ^2 is positioned horizontally such that its north pole points towards the north. Determine the location of the neutral point,A magnetic dipole having a magnetic moment of 0.72 2 A m ^2 is oriented horizontally such that its north pole points towards the east. Determine the position of a neutral point, gi Assume the magnetic moment of the dipole at the earth's centre is 8.0 10²² A m ^2 . Determine the magnetic field B at the earth's geomagnetic poles. The radius of the earth is 6400 Suppose the magnitude of the earth's magnetic field at the magnetic equator is 3.4 10⁻⁵ T . Find its value at the geomagnetic poles of the earth. Full Permanent Magnets list All Concepts Of Physics MCQ Edition [Volume 2] PYQs