Current Electricity — Physics STD 12 Science — Question

Can electric field at a point be zero, while electric potential is not zero?

If the molecules were not allowed to collide among themselves, would you expect more evaporation or less evaporation?

Two conducting wires X and Y of same diameter but different materials are joined in series across a battery. If the number density of electrons in X is twice that in Y, find the ratio of drift velocity of electrons in the two wires.

Write formula for Lorentz force on a charged particle passing through electric and magnetic field.

If plane of any loop is kept parallel to the magnetic field, then what is the magnitude of magnetic flux associated with the loop?

Write the relation between orbital radius and electron velocity.

Answer the following question:
A charged particle enters an environment of a strong and non-uniform magnetic field varying from point to point both in magnitude and direction, and comes out of it following a complicated trajectory. Would its final speed equal the initial speed if it suffered no collisions with the environment?

It is said that the assumptions of kinetic theory are good for gases having low densities. Suppose a container is so evacuated that only one molecule is left in it. Which of the assumptions of kinetic theory will not be valid for such a situation? Can we assign a temperature to this gas?

Write name of electromagnetic radiation with highest penetration power.