| 1. | Two spheres A and B of exactly same mass are given equal positive and negative charges respectively. Their masses after charging ? | |
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mass of A < mass of B
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remains unaffected
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mass of A > mass of B
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Nothing can be said
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Report Question| 2. | If a linear isotropic dielectric is placed in an electric field of strength E, then the polarization P is ? | |
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directly proportional to E
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directly proportional to E
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inversely proportional to E
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independent of E
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| 3. | If the flux of the electric field through a closed surface is zero, then ? | |
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the charge in the vicinity of the surface must be zero
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the charge inside the surface must be zero
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the electric field must be zero everywhere on the surface
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the electric field may not be zero everywhere on the surface
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| 4. | Corona discharge is caused by ? | |
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Charges moving into the ionized air under the effect of this electric field.
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Ionization of gas molecules due to dielectric breakdown
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All of the above
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High charge density causing high electric fields near a metal’s surface.
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| 5. | When a comb rubbed with dry hair attracts pieces of paper. This is because the ? | |
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comb induces a net dipole moment perpendicular to the direction of field
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comb polarizes the piece of paper
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electric field due to the comb is uniform
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comb induces a net dipole moment opposite to the direction of field
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| 6. | When a body is charged by induction, then the body ? | |
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does not lose any charge
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loses part of the charge on it
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becomes neutral
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loses whole of the charge on it
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| 7. | SI unit of permittivity of free space is ? | |
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C^2N^-1 m^-2
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Farad
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C^2N^-1 m^-1
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Weber
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| 8. | A body is positively charged, it implies that ? | |
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negative charge is displaced from its position
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there is only positive charge in the body.
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there is equal positive and negative charge in the body but the positive charge lies in the outer regions
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there is positive as well as negative charge in the body but the positive charge is more than negative charge
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| 9. | Two point charges + Q and + q are separated by a certain distance. If + Q > + q then in between the charges the electric field is zero at a point ? | |
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no where on the line segment joining + Q and + q.
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exactly at the mid-point of line segment joining + Q and + q.
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closer to + q
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closer to + Q
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| 10. | Positive electric flux indicates that electric lines of force are directed ? | |
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inwards
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either (a) or (b)
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outwards
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None of these
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