471457138 A level physics worksheet 09 pdf PDF

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9 Worksheet (AS) Data needed to answer questions can be found in the Data, formulae and relationships sheet. 1

Which statement defines electric field strength between two parallel plates? A B C D

2

[1]

Electric field strength is equal to the charge per unit distance between the plates. Electric field strength is equal to the force per unit charge. Electric field strength is equal to force times the distance between the plates. Electric field strength is equal to the potential difference times the distance between the plates.

Which diagram correctly shows the electric field between two charged plates?

A

B

C

D

[1] 3

The diagram shows two parallel, charged plates.

Which statement about the electric field at points P, Q and R is correct? A B C D

[1]

The field at P is greater than the field at Q and R. The field at P is less than the field at Q and R. The fields at P and Q are equal but greater than the field at R. The fields at all points P, Q and R are all equal.

AS and A Level Physics

Original material © Cambridge University Press 2010

1

9 Worksheet (AS)

4

There is a potential difference of 200 V across a pair of parallel plates which are 4.00 cm apart. Calculate the force on a charge of 2.50 nC which is between the plates. A B C D

5

2.00 × 10−9 N 1.25 × 10−7 N 2.00 × 10−7 N 1.25 × 10−5 N

[1]

Which diagram correctly shows the electric field between two parallel plates and the path of an electron as it passes between the plates?

A

B

C

D

[1] 6 State two possible SI units for electric field strength.

[2]

7 A +5.0 × 10−8 C point charge experiences a force of 1.5 × 10−3 N when placed in a uniform electric field. Calculate the electric field strength. 8 Calculate the force experienced by an oil droplet with a charge of 3.2 × 10 uniform electric field of strength 5.0 × 105 V m−1.

AS and A Level Physics

−19

[2]

C due to a

Original material © Cambridge University Press 2010

[2]

2

9 Worksheet (AS)

9 The diagram shows two parallel, horizontal plates separated by a vertical distance of 3.0 cm. The potential difference between the plates is 600 V.

a Calculate the magnitude and direction of the electric field between the plates. b Describe the electric field between the plates. c An oil droplet of weight 6.4 × 10−15 N is held stationary between the two plates. i State whether the charge on the droplet is positive or negative. Explain your answer. ii Determine the charge on the oil droplet.

[3] [2]

[2] [2]

10 A proton is travelling at right angles to an electric field of strength 2.40 × 10–6 V m–1. a Calculate the force on the proton due to the electric field. b Calculate the acceleration of the proton in the direction of the field. c Write down the acceleration of the proton at right angles to the field.

[2] [2] [1]

11 A pair of parallel plates are 5.0 cm apart and are connected to a 200 V supply. A particle of dust between the plates experiences a force, due to the field, of 3.2 × 10−4 N. Calculate the charge on the dust particle.

[3]

Total:

AS and A Level Physics

28

Score:

Original material © Cambridge University Press 2010

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