- AMagnetic neutrality.
- BMagnetic polarization.
- CMagnetic power.
- DMagnetic moment.
Explanation:
Magnetization is also termed as magnetic polarization. Magnetic polarization is basically a balance between the magnetic flux density in a space which is devoid of matter and the magnetic flux density in a space with matter, i.e. in a material.
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There is a current of 40 ampere in a wire of
area of cross-section. If the number of free electron per
is
, then the drift velocity will be
|
(a) 1.25 × |
(b) 2.50 × |
(c) 25.0 × |
(d) 250 × |
In a photo cell, the photo-electrons emission takes place
|
(a) After 10–1 sec on incident of light rays |
|
(b) After 10–3 sec on incident of light rays |
|
(c) After 10–6 sec on incident of light rays |
|
(d) After 10–8 sec on incident of light rays |

Isotopes are atoms having
|
(a) Same number of protons but different number of neutrons |
|
(b) Same number of neutrons but different number of protons |
|
(c) Same number of protons and neutrons |
|
(d) None of the above |
A nichrome wire 50 cm long and one square millimetre cross-section carries a current of 4A when connected to a 2V battery. The resistivity of nichrome wire in ohm metre is
|
(a) 1 |
(b) 4 |
(c) 3 |
(d) 2 |
Two condensers of capacities 2C and C are joined in parallel and charged upto potential V. The battery is removed and the condenser of capacity C is filled completely with a medium of dielectric constant K. The p.d. across the capacitors will now be
|
(a) |
(b) |
(c) |
(d) |
The resistivity of iron is 1
. The resistance of a iron wire of particular length and thickness is 1 ohm. If the length and the diameter of wire both are doubled, then the resistivity in ohm - m will be
|
(a) |
(b) 2 |
(c) 4 |
(d) 8 |
