Electric Charges and Fields — Physics STD 12 Science — Question

Mark out the correct options.

1. Diamagnetism occurs in all materials.
2. Diamagnetism results from the partial alignment of permanent magnetic moment.
3. The magnetizing field intensity H is always zero in free space.
4. The magnetic field of induced magnetic moment is opposite to the applied field.

Gases begin to conduct electricity at low pressure because(a) At low pressure, gases turn to plasma(b) Colliding electrons can acquire higher kinetic energy due to increased mean free path leading to ionisation of atoms(c) Atoms break up into electrons and protons(d) The electrons in atoms can move freely at low pressure

The magnitude of the electric field due to a point charge at a distance of 4.0 m is 9 N/C. Distance of this point charged substance due to electric field of magnitude 16 N/C will be:

A capacitor having capacitance  C is charged to a voltage V. It is then removed and connected in parallel with another identical capacitor which is uncharged. The new charge on each capacitor is now(a) CV(b) CV / 2(c) 2 CV   (d) CV / 4

Ray optics is valid when characteristic dimensions are:

How is the electric field between the two plates of a parallel plate capacitor?

What is the space around a current-carrying conductor, in which its magnetic effect can be experienced called?

The mass of the electron varies with(a) The size of the cathode ray tube(b) The variation of ‘g’(c) Velocity(d) Size of the electron