In the circuit shown here, E1 = E2 = E3 = 2 V and R1 = R2 = 4 ohms. The current flowing between points A and B through battery E2 is
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(a) Zero |
(b) 2 amp from A to B |
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(c) 2 amp from B to A |
(d) None of the above |
(b) 2 amp from A to B
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An electron (charge q coulomb) enters a magnetic field of H 
with a velocity of vm/s in the same direction as that of the field the force on the electron is
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(a) Hqv Newton’s in the direction of the magnetic field |
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(b) Hqv dynes in the direction of the magnetic field |
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(c) Hqv Newton’s at right angles to the direction of the magnetic field |
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(d) Zero |
Points A and B are situated perpendicular to the axis of a 2cm long bar magnet at large distances X and 3X from its centre on opposite sides. The ratio of the magnetic fields at A and B will be approximately equal to
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(a) 1 : 9 |
(b) 2 : 9 |
(c) 27 : 1 |
(d) 9 : 1 |
Assertion : The induced emf in a conducting loop of wire will be non zero when it rotates in a uniform magnetic field.
Reason : The emf is induced due to change in magnetic flux.
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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 relaxation time in conductors
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(a) Increases with the increase of temperature |
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(b) Decreases with the increase of temperature |
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(c) It does not depend on temperature |
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(d) All of sudden changes at 400 K |
The current in the given circuit is
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(a) 8.31 A |
(b) 6.82 A |
(c) 4.92 A |
(d) 2 A |