1
1 mark
1 markThe force between two identical point charges, X and Y, is F.
Charge X is doubled; charge Y remains the same.
Which row of the table gives the force on each charge?
| X | Y | |
| A | F | F |
| B | F | 2F |
| C | 2F | F |
| D | 2F | 2F |
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Electric Fields
11 mark
1 markThe graph shows how an electric potential V varies with distance x.
Which of the following shows the corresponding variation of electric field strength E with x?
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11 mark
1 markThe distance between a proton and an electron is r. The electrostatic force is F.
The distance between the proton and electron is doubled.
Which of the following is equal to the electrostatic force at this separation?
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21 mark
1 markA potential difference is applied across two parallel plates. A particle carrying a charge of +0.1 C is placed between the plates and experiences a force F.
The distance between the plates is halved. The potential difference remains constant.
Which of the following is now equal to the electric field strength between the plates?
5 F
10 F
20 F
40 F
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31 mark
1 markA potential difference V is applied across two parallel plates. An electron midway between the two plates at point X experiences an electric force F.
The electron moves to point Y which is halfway between point X and the left-hand plate.
Which of the following is the electric force experienced by the electron at Y?
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