Semiconductor Electronic: Material, Devices And Simple Circuits — Physics STD 12 Science — Question

What is doping?

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

A bar magnet is moved in the direction indicated by the arrow between two coils PQ and CD. Predict the direction of the induced current in each coil.

What is the specialty of sunglasses made from polaroid instead of ordinary glass?

Answer the following questions:
The charged currents in the outer conducting regions of the earth’s core are thought to be responsible for earth’s magnetism. What might be the ‘battery’ (i.e., the source of energy) to sustain these currents?

Two particles A and B start from rest and move for equal time on a straight line. The particle A has an acceleration a for the first half of the total time and 2a for the second half. The particle B has an acceleration 2a for the first half and a for the second half. Which particle has covered larger distance?

What effect does the dielectric medium have on the capacitance of a capacitor?

A simple pendulum is a point mass suspended by a light thread from a fixed point. The particle is displaced towards one side and then released. It makes small oscillations. Is the motion of such a simple pendulum a pure rotation? If yes, where is the axis of rotation?

Name the part of electromagnetic spectrum which is used for taking photographs of earth under foggy conditions from great heights.