Moving Charges and Magnetism — Physics STD 12 Science — Question

A 60 watt bulb carries a current of 0.5 amp. The total charge passing through it in 1 hour is           

(a) 3600 coulomb

(b) 3000 coulomb

(c) 2400 coulomb

(d) 1800 coulomb

Which of the following devices is the more accurate one for the measurement of emf?

A heating coil can heat the water of a vessel from 20℃ to 60℃  in 30 minutes. Two such heating coils are put in series and then used to heat the same amount of water through the same temperature range. The time taken now will be (neglecting thermal capacity of the coils)

(a) 60 minutes

(b) 30 minutes

(c) 15 minutes

(d) 7.5 minutes

The unit of electric permittivity is

(a) Volt/m2

(b) Joule/coulomb

(c) Farad/m

(d) Henry/m

Which of the following uses the principle of electromagnetic induction?

The momentum of the photon of wavelength 5000Å  will be

(a) 1.3  m/sec	(b) 1.3   m/sec
(c) 4  m/sec	(d) 4  m/sec

An electron moving to the east in a horizontal plane is deflected towards south by a magnetic field. The direction of this magnetic field is:

A particle has a velocity u towards east at t = 0. Its acceleration is towards west and is constant. Let x_A and x_B be the magnitude of displacements in the first 10 seconds and the next 10 seconds:

1. x_A < x_B
2. x_A = x_B
3. x_A > x_B
4. The information is insufficient to decide the relation of x_A with x_B.

There is no hole current in conductors, because they have:

Which of the following has a negative temperature coefficient

(a) C

(b) Fe

(c) Mn

(d) Ag