For measurement of potential difference, potentiometer is preferred in comparison to voltmeter because
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(a) Potentiometer is more sensitive than voltmeter |
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(b) The resistance of potentiometer is less than voltmeter |
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(c) Potentiometer is cheaper than voltmeter |
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(d) Potentiometer does not take current from the circuit |
(d) Potentiometer does not take current from the circuit
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What will be the resultant magnetic field at origin due to four infinite length wires. If each wire produces magnetic field 'B' at origin
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(a) 4 B |
(b) |
(c) 2 |
(d) Zero |
Assertion : Leclanche cell is used, when constant supply of electric current is not required.
Reason : The e.m.f. of a Leclanche cell falls, if it is used continuously.
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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. |
