Umakant Kondapure, Collin Fernandes, Nipun Bhatia, Vikram Bathula and, Ketki Deshpande Solutions for Chapter: Magnetism, Exercise 2: Critical Thinking

According to the atomic theory, on heating a magnet, the thermal energy of the elementary magnet

The north pole of a magnet is brought near a stationary negatively charged conductor. Will the pole experience any force?

The orbital speed of an electron orbiting around the nucleus in a circular orbit of radius is $v$. Then the magnetic dipole moment of the electron will be

Which of the following is a vector quantity?

Choose the correct statement/s:
(i) Magnetic field lines try to expand in length.
(ii) Magnetic field lines repel each other laterally.
(iii) Magnetic field lines attract each other laterally.
(iv) Magnetic field lines are crowded in region where magnetic induction has least value.

Assertion: We cannot think of magnetic field configuration with three poles.

Reason: A bar magnet does exert a torque on itself due to its own field.

Assertion: The basic difference between an electric line and a magnetic line of force is that the former is discontinuous and the latter is continuous or endless.

Reason: No electric lines of forces exist inside a charged body, but magnetic lines do exist inside a magnet.

The electron in the hydrogen atom is moving with a speed of  $2.3\times {10}^6 \mathrm{m} {\mathrm{s}}^{-1}$ in an orbit of radius $0.53 \mathrm{A}.$ Calculate the magnetic moment of the revolving electron.