Electric Fields

Part a

2 minutes 1 marks

Question

Define electric field strength at a point in space. [1]

Hint Hint

Hint

Think about how you would measure or detect an electric field using a charge.

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Force per unit positive charge (experienced by a small/point test charge placed at that point).

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Part b

3 minutes 2 marks

Question

Two parallel metal plates are separated by a distance of 5.0 cm and have a potential difference of 120 V between them. Calculate the magnitude of the electric field strength between the plates, assuming it is uniform. [2]

Hint Hint

Hint

For a uniform electric field between parallel plates, use the relation E = V / d. Remember to convert the distance into SI units.

Answer Answer
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2400 V m⁻¹ (or N C⁻¹)

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Part c

3 minutes 2 marks

Question

Interpret the provided visualization that illustrates the electric field pattern around an isolated positive point charge.
Describe two features of the visualization that indicate the charge’s positive nature and its isolated configuration. [2]

Hint Hint

Hint

Examine the direction and the arrangement of the field lines in the provided visualization. How does the direction support that the charge is positive, and what does the spacing suggest about the charge being isolated?

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1. The field lines are directed radially outward, indicating a positive charge. 2. The lines are drawn as straight, evenly spaced, and symmetrically distributed around the charge, which indicates that the charge is isolated. (Any two distinct, valid features)

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Electric Fields

Part a

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Part b

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Part c

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Electric Fields

Part a

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Part b

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Part c

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