- Alaw of conservation of energy
- Blaw of conservation of momentum
- Claw of conservation of angular momentum
- ✓law of conservation of charge
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When a certain length of wire is turned into one circular loop, the magnetic induction at the centre of coil due to some current flowing is
If the same wire is turned into three loops to make a circular coil, the magnetic induction at the center of this coil for the same current will be
|
(a) |
(b) 9 |
(c) 3 |
(d) 27 |
A element used for radioactive carbon dating for more than 5600 years is
|
(a) C - 14 |
(b) U - 234 |
(c) U - 238 |
(d) Po - 94 |

Two pure inductors each of self inductance L are connected in parallel but are well separated from each other. The total inductance is
|
(a) 2L |
(b) L |
(c) |
(d) |
An electron of mass m and charge q is travelling with a speed v along a circular path of radius r at right angles to a uniform of magnetic field B. If speed of the electron is doubled and the magnetic field is halved, then resulting path would have a radius of
|
(a) |
(b) |
(c) 2r |
(d) 4r |