- AElectric field
- BMagnetic pole
- CMagnetic field
- DCharge distribution
Explanation:
The space around a current-carrying conductor, in which its magnetic effect can be experienced is called the magnetic field.
When a current is passed through a conductor, it modifies the space around the conductor and forms a magnetic field.
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Assertion : In practical application, power rating of resistance is not important.
Reason : Property of resistance remain same even at high temperature.
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(a) If both assertion and reason are true and the reason is the correct explanation of the assertion. |
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(b) If both assertion and reason are true but reason is not the correct explanation of the assertion. |
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(c) If assertion is true but reason is false. |
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(d) If the assertion and reason both are false. |
If the two ends P and N of a P-N diode junction are joined by a wire
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(a) There will not be a steady current in the circuit |
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(b) There will be a steady current from N side to P side |
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(c) There will be a steady current from P side to N side |
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(d) There may not be a current depending upon the resistance of the connecting wire |
Two PN-junctions can be connected in series by three different methods as shown in the figure. If the potential difference in the junctions is the same, then the correct connections will be
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(a) In the circuit (1) and (2) |
(b) In the circuit (2) and (3) |
| (c) In the circuit (1) and (3) | (d) Only in the circuit (1) |
One cannot see through fog because .......... :
The magnetic induction in air at a distance d from an isolated point pole of strength m unit will be
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(a) |
(b) |
(c) md |
(d) |
The colour sequence in a carbon resistor is red, brown, orange and silver. The resistance of the resistor is
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(a) 21 × 103 ± 10% |
(b) 23 × 101 ± 10 % |
(c) 21 × 103 ± 5% |
(d) 12 × 103 ± 5% |