Electromagnetic Waves — Physics STD 12 Science — Question

Electrostatic field lines ____.

The particle that possesses half integral spin is:

Electric current is due to drift of electrons in:

50% of the X-ray coming from a Coolidge tube is able to pass through a 0.1mm thick aluminium foil. The potential difference between the target and the filament is increased. The thickness of the aluminium foil that will allow 50% of the X-ray to pass through will be:

1. zero
2. < 0.1mm
3. 0.1mm
4. > 0.1mm

The conductivity of a superconductor is(a) Infinite(b) Very large(c) Very small(d) Zero

Give the unit of work function.

A non-conducting solid sphere of radius R is uniformly charged. The magnitude of the electric field due to the sphere at a distance r  from its centre(a) Increases as r increases for r < R(b) Decreases as r  increases for 0 < r < ∞(c) Decreases as r  increases for R < r < ∞(d) a, c