When a current carrying conductor is brought into magnetic field, the force that moves the conductor depends upon

When a wave is incident from the more dense into a less dense medium at an angle equal to or exceeding the critical angle, the wave suffers total internal __________ .

Due to which of the following reasons a lightning conductor on top of a building is made into a pointed spike?

A satellite that simply reflect back the signals from one region of the earth to the other region is known as