Electrostatics — Physics STD 12 Science — Question

The electrostatic potential due to an electric dipole is inversely proportional to:

How is galvanometer converted into a voltmeter?

Four charges +Q, -Q, +Q, -Q  are placed at the corners of a square taken in order. At the centre of the square

(a) E = 0, V = 0

(b) E = 0, V ≠ 0

(c) E ≠ 0, V = 0

(d) E = 0, V ≠ 0

In a Bainbridge mass spectrometer positive rays of the same element produce different traces. The traces correspond to:

Two sources of monochromatic light in coherent, when their :

The radius of circular path of an electron when subjected to a perpendicular magnetic field is

(a)

(b)

(c)

(d)

A piece of charcoal and a piece of shining steel of the same surface area are kept for a long time in an open lawn in bright sun:

1. The steel will absorb more heat than the charcoal.
2. The temperature of the steel will be higher than that of the charcoal.
3. If both are picked up by bare hands, the steel will be felt hotter than the charcoal.
4. If the two are picked up from the lawn and kept in a cold chamber, the charcoal will lose heat at a faster rate than the steel.

Which of the following is an example of a molecule whose centre of mass of positive and negative charges coincide each other?

Bell laboratory has developed superconductor at a temperature of: