Moving Charges and Magnetism — Physics STD 12 Science — Question

A vertical wire carries a current in upward direction. An electron beam sent horizontally towards the wire will be deflected:

The length of the wire is doubled. Its conductance will be(a) Unchanged(b) Halved(c) Quadrupled(d) 1/4 of the original value

Two bullets are fired simultaneously, horizontally and with different speeds from the same place. Which bullet will hit the ground first?

1. The faster one.
2. The slower one.
3. Both will reach simultaneously.
4. Depends on the masses.

When water droplets merge to form a bigger drop:

1. Energy is liberated.
2. Energy is absorbed.
3. Energy is neither liberated nor absobred.
4. Energy may either be liberated or absorbed depending on the nature of the liquid.

In Young’s double slit experiment, the distance between the two slits is made half, then the fringe width will become(a) Half(b) Double(c) One fourth(d) Unchanged

Assertion :   A star which appears blue will be much hotter than the sun
Reason     : It is based on Wien's law(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.

A copper ring is suspended by a thread in a vertical plane. If one end of a magnet is brought horizontally towards the ring in plane of ring as shown, the ring will.