Moving Charges and Magnetism — Physics STD 12 Science — Question

The equivalent capacitance between A and B is:

When a negative charge is taken at a height from earth's surface, then its potential energy   (a) Decreases(b) Increases(c) Remains unchanged(d) Will become infinity

Assertion :  A transistor is a voltage-operating device.
Reason     : Base current is greater than the collector current.(a) If both assertion and reason are true and the reason is the correct explanation of the assertion.(b) If both assertion and reason are true but reason is not the correct explanation of the assertion.(c) If assertion is true but reason is false.(d) If the assertion and reason both are false.

Peltier coefficient for the junction of a pair of metals is proportional to

Which of the following will produce greater chromatic aberration?

If the de-Broglie wavelengths for a proton and for a α - particle are equal, then the ratio of their velocities will be(a) 4 : 1(b) 2 : 1(c) 1 : 2(d) 1 : 4

Assertion :  Electron has higher mobility than hole in a semiconductor.
Reason     : Mass of electron is less than the mass of hole. (a) If both assertion and reason are true and the reason is the correct explanation of the assertion.(b) If both assertion and reason are true but reason is not the correct explanation of the assertion.(c) If assertion is true but reason is false.(d) If the assertion and reason both are false.

Let V and H be the vertical and horizontal components of earth's magnetic field at any point on earth. Near the north pole(a) V >> H(b) V << H (c) V = H  (d) V = H = 0