Moving Charges and Magnetism — Physics STD 12 Science — Question

Resistance of semiconductor at 0 K  is

(a) Zero

(b) Infinite

(c) Large

(d) Small

The vecter term of coulomb's law is :

Which of the following statements indicates that light waves are transverse

(a) Light waves can travel in vacuum	(b) Light waves show interference
(c) Light waves can be polarized	(d) Light waves can be diffracted

Intensity of magnetic field due to earth at a point inside a hollow steel box is

(a) Less than outside

(b) More than outside

(c) Same

(d) Zero

Curies law can be written as

(a) x ∝ (T -

(b) x ∝

(c) x ∝

(d) x ∝ T

The maximum current that can be measured by a galvanometer of resistance 40 W is 10 mA. It is converted into a voltmeter that can read upto 50 V. The resistance to be connected in series with the galvanometer is ... (in ohm)

 

(a) 5040

(b) 4960

(c) 2010

(d) 4050

A sample contains 16 gm of a radioactive material, the half life of which is two days. After 32 days, the amount of radioactive material left in the sample is

(a) Less than 1 mg

(b)

(c)

(d) 1 gm

What is the maximum energy that can be stored in a capacitor?

Impedance of L-R circuit is :

A capacitor of capacitance 5 micro farads is charged to 1000 volts. The energy stored on the capacitor will be (in joules):