Electrostatic Potential and Capacitance — Physics STD 12 Science — Question

1. The flux of the electric field through the sphere is zero.
2. The electric field is zero at every point of the sphere.
3. The electric field is not zero anywhere on the sphere.
4. The electric field is zero on a circle on the sphere.

Which of the following phenomena contributes significantly to the reddish appearance of the sun at sunrise or sunset?

As in figure shown, if a capacitor C is charged by connecting it with resistance R, then energy is given by the battery will be

The capacity of an air condenser is 2.0 mF. If a medium is placed between its plates. The capacity becomes 12 mF. The dielectric constant of the medium will be

Two charge + q  and  -q  are situated at a certain distance.  At the point exactly midway between them

As the temperature of hot junction of a thermo‑couple is increased (while cold junction is at constant temperature), the thermo e.m.f.

Which one of the following have minimum wavelength