| 1. | An electron having a charge e moves with a velocity v in X-direction. An electric field acts on it in Y-direction? The force on the electron acts in ? | |
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negative direction of Y-axis
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negative direction of Z-axis
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positive direction of Y-axis
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positive direction of Z-axis
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Report Question| 2. | The current sensitivity of a galvanometer is defined as ? | |
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current per unit deflection.
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deflection per unit current when a unit voltage is applied across its terminals
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the current flowing through the galvanometer when a unit voltage is applied across its terminals.
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deflection per unit current.
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| 3. | Biot-Savart law indicates that the moving electrons (velocity v) produce a magnetic field B such that ? | |
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it is along the line joining the electron and point of observation
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it obeys inverse cube law
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B is perpendicular to v
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B is parallel to v
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| 4. | A current loop placed in a non-uniform magnetic field experiences ? | |
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a torque but not force.
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a force and a torque.
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a force of attraction.
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a force of repulsion.
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| 5. | If we double the radius of a coil keeping the current through it unchanged, then the magnetic field at any point at a large distance from the centre becomes approximately ? | |
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one-fourth
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three times
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four times
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double
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| 6. | If a long hollow copper pipe carries a direct current, the magnetic field associated with the current will be ? | |
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only inside the pipe
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both inside and outside the pipe
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only outside the pipe
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neither inside nor outside the pipe
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| 7. | Magnetic dipole moment of a rectangular loop is ? | |
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parallel to plane of loop and proportional to area of loop
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inversely proportional to area of loop
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perpendicular to plane of loop and proportional to area of loop
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inversely proportional to current in loop
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| 8. | The magnetic moment of a circular coil carrying current is ? | |
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inversely proportional to the square of the length of the wire in the coil
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directly proportional to the square of the length of the wire in the coil
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inversely proportional to the length of the wire in the coil
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directly proportional to the length of the wire in the coil
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| 9. | Two free parallel wires carrying currents in the opposite directions ? | |
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do not attract each other
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attract each other
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repel each other
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get rotated to be perpendicular to each other
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| 10. | A proton and an alpha particle both enter a region of uniform magnetic field B, moving at right angles to field B. If the radius of circular orbits for both the particles is equal and the kinetic energy acquired by proton is 1 MeV the energy acquired by the alpha particle will be ? | |
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0.5 MeV
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1.5 MeV
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1 MeV
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4 MeV
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