- AAn ammeter should have small resistance.
- BAn ammeter should have large resistance.
- CA voltmeter should have small resistance.
- DA voltmeter should have large resistance.
A voltmeter should have large resistance.
Explanation:
Þ An ammeter should have small resistane. To measure the accurate reading of current in the circuit by Ammeter.
þ A voltmeter should have large resistance. To measure the accurate reading of voltage across voltmeter.
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Assertion : When radius of circular loop carrying current is doubled, its magnetic moment becomes four times.
Reason : Magnetic moment depends on area of the loop.
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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. |

For the given circuit of PN-junction diode, which of the following statement is correct

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(a) In forward biasing the voltage across R is V |
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(b) In forward biasing the voltage across R is 2V |
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(c) In reverse biasing the voltage across R is V |
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(d) In reverse biasing the voltage across R is 2V |
Two charged spheres of radii 10 cm and 15 cm are connected by a thin wire. No current will flow, if they have
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(a) The same charge on each |
(b) The same potential |
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(c) The same energy |
(d) The same field on their surfaces |
In the following diagram the work done in moving a point charge from point P to point A, B and C is respectively as WA, WB and WC , then

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(a) WA = WB = WC |
(b) WA = WB = WC = 0 |
(c) WA > WB > WC |
(d) WA < WB < WC |