Electrostatic Potential and Capacitance — Physics STD 12 Science — Question

In the propagation of electromagnetic waves, the angle between the direction of propagation and plane of polarisation is

The coil of the moving coil galvanometer is wound over an aluminium frame:

Which of the following is not the function of a NOT gate?

Two rays A and B being reflected by a mirror and going as A' and B'. The mirror:

1. Is plane.
2. Is convex.
3. Is concave.
4. May be any spherical mirror.

Ampere’s circuital law states that:

Two point charges of 20μC and 80 μC are 10 cm apart. Where will the electric field strength be zero on the line joining the charges from 20 μC  charge(a) 0.1 m             (b) 0.04 m (c) 0.033 m(d) 0.33 m

Electrostatic potential is ______ throughout the volume of the conductor and has _____ value on its surface.

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.

A proton beam is going from north to south and an electron beam is going from south to north. Neglecting the earth's magnetic field, the electron beam will be deflected

1. Towards the proton beam.
2. Away from the proton beam.
3. Upwards.
4. Downwards.