Electric Charges and Fields — Physics STD 12 Science — Question

Gauss's law in dielectric medium:

The capacity of parallel plate condenser depends on

(a) The type of metal used	(b) The thickness of plates
(c) The potential applied across the plates	(d) The separation between the plates

If a resistance  is connected in parallel with the resistance R in the circuit shown, then possible value of current through R and the possible value of   will be

(a)

(b) I, 2R

(c)

(d)

Two parallel wires in free space are 10 cm apart and each carries a current of 10 A in the same direction. The force one wire exerts on the other per metre of length is

(a) 2 , attractive	(b) 2, repulsive
(c) 2  , attractive	(d) 2  , repulsive

If the refractive indices of a prism for red, yellow and violet colours be 1.61, 1.63 and 1.65 respectively, then the dispersive power of the prism will be

(a)

(b)

(c)

(d)

When a current in a circular loop is equivalently replaced by a magnetic dipole:

Wave nature of light is verified by ___________.

Consider a photon of continuous X-ray and a photon of characteristic X-ray of the same wavelength. Which of the following is/are different for the two photons?

1. Frequency.
2. Energy.
3. Penetrating power.
4. Method of creation.

Two long straight parallel conductors separated by a distance of 0.5m carry currents of 5A and 8A in the same direction. The force per unit length experienced by each other is

(a) 1.3  (attractive)	(b) 1.6   (repulsive)
(c) 16  (attractive)	(d) 16  (repulsive)

In hydrogen atom, when electron jumps from second to first orbit, then energy emitted is

(a) – 13.6 eV

(b) – 27.2 eV

(c) – 6.8 eV

(d) None of these