Explanation:
A magnetic dipole possess maximum potential energy when its magnetic moment and the magnetic field are antiparallel. When the magnetic dipole is aligned along the magnetic field, i.e. when $θ = 180^\circ,$ it is in unstable equilibrium having maximum potential energy.
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In order to forward bias a PN junction, the negative terminal of battery is connected to
|
(a) P–side |
(b) Either P–side or N–side |
|
(c) N–side |
(d) None of these |
The line on the earth's surface joining the points where the field is horizontal is
| (a) Magnetic meridian | (b) Magnetic axis | (c) Magnetic line | (d) Magnetic equator |
The current inside a copper voltameter
|
(a) Is half the outside value |
(b) Is the same as the outside value |
|
(c) Is twice the outside value |
(d) Depends on the concentration of |
When the distance between the charged particles is halved, the force between them becomes
|
(a) One-fourth |
(b) Half |
(c) Double |
(d) Four times |
The energy of a photon is E = hv and the momentum of photon p = 
, then the velocity of photon will be
|
(a) E/p |
(b) Ep |
(c) |
(d) 3 |
