MCQ
For a single charge the field lines start or ends at:
- APositive charge.
- BNegative charge.
- CInfinity.
- DNone.
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In a primary coil 5A current is flowing on 220 volts. In the secondary coil 2200V voltage produces. Then ratio of number of turns in secondary coil and primary coil will be
|
(a) 1 : 10 |
(b) 10 : 1 |
(c) 1 : 1 |
(d) 11 : 1 |
An electric heater of resistance 6 ohm is run for 10 minutes on a 120 volt line. The energy liberated in this period of time is
|
(a) 7.2 |
(b) 14.4 |
(c) 43.2 |
(d) 28.8 |