Moving Charges and Magnetism — Physics STD 12 Science — Question

Ohm's law is true

(a) For metallic conductors at low temperature

(b) For metallic conductors at high temperature

(c) For electrolytes when current passes through them

(d) For diode when current flows

Susceptibility of ferromagnetic substance is

(a) > 1

(b) < 1

(c) 0

(d) 1

A wire cd of length l and mass m is sliding without friction on conducting rails ax and by as shown. The vertical rails are connected to each other with a resistance R between a and b. A uniform magnetic field B is applied perpendicular to the plane abcd such that cd moves with a constant velocity of

(a)

(b)

(c)

(d)

Potential energy is the characteristic of the:

In Young’s double slit experiment, the intensity of light coming from the first slit is double the intensity from the second slit. The ratio of the maximum intensity to the minimum intensity on the interference fringe pattern observed is

(a) 34

(b) 40

(c) 25

(d) 38

Heat produced in a wire of resistance R due to current flowing at constant potential difference is proportional to

(a)

(b)

(c) R

(d)

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

The magnitude of i in ampere unit is

(a) 0.1

(b) 0.3

(c) 0.6

(d) None of these

The energy equivalent of 1 kilogram of matter is about

(a)  J

(b) 1 J

(c)  J

(d)  J