A current carrying small loop behaves like a small magnet. If A be its area and M its magnetic moment, the current in the loop will be
|
(a) M/A |
(b) AIM |
(c) MA |
(d) |
(a) M/A
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A magnet of magnetic moment M is rotated through 360° in a magnetic field H, the work done will be
| (a) MH | (b) 2MH | (c) 2πMH | (d) Zero |
If a drop of water is introduced between the glass plate and a convex lens in a Newton's ring system, the ring system:
Electric potential is given by 
T, hen electric force acting on 2C point charge placed on origin will be
|
(a) 2N |
(b) 6N |
(c) 8N |
(d) 20 N |
The number of turns in the primary coil of a transformer is 200 and the number of turns in the secondary coil is 10. If 240 volt AC is applied to the primary, the output from the secondary will be
|
(a) 48 V |
(b) 24 V |
(c) 12 V |
(d) 6 V |
The potential gradient along the length of a uniform wire is 10 volt/metre. B and C are the two points at 30 cm and 60 cm point on a meter scale fitted along the wire. The potential difference between B and C will be
|
(a) 3 volt |
(b) 0.4 volt |
(c) 7 volt |
(d) 4 volt |
A coil of inductance L is carrying a steady current i. What is the nature of its stored energy
|
(a) Magnetic |
(b) Electrical |
|
(c) Both magnetic and electrical |
(d) Heat |
A particle A has charge +q and a particle B has charge +4q with each of them having the same mass m. When allowed to fall from rest through the same electric potential difference, the ratio of their speed 
will become
|
(a) 2 : 1 |
(b) 1 : 2 |
(c) 1 : 4 |
(d) 4 : 1 |
The direction of line of magnetic field of bar magnet is
|
(a) From south pole to north pole |
|
(b) From north pole to south pole |
|
(c) Across the bar magnet |
|
(d) From south pole to north pole inside the magnet and from north pole to south pole outside the magnet |
