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If resistance of voltmeter is 10000 W and resistance of ammeter is 2 W then find R when voltmeter reads 12V and ammeter reads 0.1 A
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(a) 118 W |
(b) 120 W |
(c) 124 W |
(d) 114W |
Assertion : The mass of b-particles when they are emitted is higher than the mass of electrons obtained by other means.
Reason : b-particle and electron, both are similar particles.
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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. |
The relative permeability is represented by mr and the susceptibility is denoted by c for a magnetic substance. Then for a paramagnetic substance
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(a) mr < 1, c < 0 |
(b) mr < 1, c > 0 |
(c) mr > 1, c < 0 |
(d) mr > 1, c > 0 |
The unit of electric field is not equivalent to
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(a) N/C |
(b) J/C |
(c) V/m |
(d) J/C - m |
Assertion : Lenz’s law violates the principle of conservation of energy.
Reason : Induced e.m.f., opposes always the change in magnetic flux responsible for its production.
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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 assertion is false but reason is true. |
A closely wound coil of 100 turns and area of cross-section 
has a coefficient of self-induction 1 mH. The magnetic induction in the centre of the core of the coil when a current of 2A flows in it, will be
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(a) |
(b) |
(c) |
(d) |
The figure shows a network of currents. The magnitude of currents is shown here. The current I will be
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(a) 3 A |
(b) 9 A |
(c) 13 A |
(d) 19 A |
