Current Electricity — Physics STD 12 Science — Question

In a cyclotron, a charged particle.

The index of refraction of diamond is 2.0, velocity of light in diamond in cm/second is approximately

(a) 6

(b) 3.0

(c)

(d)

Which theory is confirmed by the Davisson – Germer experiment?

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

The AC voltage across a resistance can be measured using:

A tank is filled with benzene to a height of 120 mm. The apparent depth of a needle lying at a bottom of the tank is measured by a microscope to be 80 mm.  The refractive index of benzene is

(a) 1.5

(b) 2.5

(c) 3.5

(d) 4.5

Which of the following best describe the electromagnetic induction?

A coil has 1,000 turns and 500 cm² as its area. The plane of the coil is placed at right angles to a magnetic induction field of 2. The coil is rotated through 180° in 0.2 seconds. The average e.m.f. induced in the coil, in milli-volts, is

(a) 5

(b) 10

(c) 15

(d) 20

A photo cell is a device which:

A capacitor is charged by using a battery which is then disconnected. A dielectric slab is introduced between the plates which results in: