10W - The uniform electric field

The following data will be needed:
magnitude of the electronic charge = 1.6 ´ 10–19 C
mass of electron = 9.1 ´ 10–31 kg
1 eV = 1.6 ´ 10–19 J

A table-tennis ball covered in conducting paint is suspended between two metal plates, A and B, which are connected via a sensitive ammeter to a high-voltage power supply. If the ball is initially given a positive charge it oscillates between plates A and B and the ammeter shows a small reading.

1.	After being given its initial charge, will the ball move to the right or to the left?

2.	State two ways in which the reading on the ammeter can be increased.

Here are two closely spaced metal plates connected to a 500 V supply.

3.	Draw solid lines to represent the electric field both between the plates and just outside the plates. Add arrows to indicate the direction of the field.
4.	Add, and label, dotted lines to represent lines of equipotential at 100 V intervals.

10W - The uniform electric field

The following data will be needed:
magnitude of the electronic charge = 1.6 ´ 10–19 C
mass of electron = 9.1 ´ 10–31 kg
1 eV = 1.6 ´ 10–19 J

A table-tennis ball covered in conducting paint is suspended between two metal plates, A and B, which are connected via a sensitive ammeter to a high-voltage power supply. If the ball is initially given a positive charge it oscillates between plates A and B and the ammeter shows a small reading.

1.	After being given its initial charge, will the ball move to the right or to the left?

2.	State two ways in which the reading on the ammeter can be increased.

Here are two closely spaced metal plates connected to a 500 V supply.

3.	Draw solid lines to represent the electric field both between the plates and just outside the plates. Add arrows to indicate the direction of the field.
4.	Add, and label, dotted lines to represent lines of equipotential at 100 V intervals.

In an experiment to measure the charge on an oil drop the potential difference between two parallel metal plates 5 mm apart was 300 V.
In an experiment to measure the charge on an oil drop the potential difference between two parallel metal plates 5 mm apart was 300 V.

5.	Calculate the electric field strength between the plates.

6.	Calculate the electrical force on a small oil drop carrying a charge of 32 ´ 10–19 C.

7.	Calculate the energy, in joules, gained by an electron accelerated through a potential difference of 50 kV in an x-ray machine.

8.	Calculate the speed of an electron with a kinetic energy of 100 eV.

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In an experiment to measure the charge on an oil drop the potential difference between two parallel metal plates 5 mm apart was 300 V.

5.	Calculate the electric field strength between the plates.

6.	Calculate the electrical force on a small oil drop carrying a charge of 32 ´ 10–19 C.

7.	Calculate the energy, in joules, gained by an electron accelerated through a potential difference of 50 kV in an x-ray machine.

8.	Calculate the speed of an electron with a kinetic energy of 100 eV.