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18.4. Electric field of a point charge
A subsection of Physics, 9702, through 18. Electric fields
Listing 10 of 13 questions
State an expression for the electric field strength E at a distance r from a point charge Q in a vacuum. State the name of any other symbol used. Two point charges A and B are situated a distance 10.0 cm apart in a vacuum, as illustrated in . P charge A charge B x 10.0 cm A point P lies on the line joining the charges A and B. Point P is a distance x from A. The variation with distance x of the electric field strength E at point P is shown in . 1.0 1.5 2.0 2.5 E / 10–2 N C–1 x / cm State and explain whether the charges A and B: have the same, or opposite, signs have the same, or different, magnitudes. An electron is situated at point P. Without calculation, state and explain the variation in the magnitude of the acceleration of the electron as it moves from the position where x = 3 cm to the position where x = 7 cm.
9702_w19_qp_41
THEORY
2019
Paper 4, Variant 1
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State an expression for the electric field strength E at a distance r from a point charge Q in a vacuum. State the name of any other symbol used. Two point charges A and B are situated a distance 10.0 cm apart in a vacuum, as illustrated in . P charge A charge B x 10.0 cm A point P lies on the line joining the charges A and B. Point P is a distance x from A. The variation with distance x of the electric field strength E at point P is shown in . 1.0 1.5 2.0 2.5 E / 10–2 N C–1 x / cm State and explain whether the charges A and B: have the same, or opposite, signs have the same, or different, magnitudes. An electron is situated at point P. Without calculation, state and explain the variation in the magnitude of the acceleration of the electron as it moves from the position where x = 3 cm to the position where x = 7 cm.
9702_w19_qp_43
THEORY
2019
Paper 4, Variant 3
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State what is meant by a field of force. State one similarity and one difference between the electric field due to a point charge and the gravitational field due to a point mass. similarity: difference: An isolated solid metal sphere of radius 0.15 m is situated in a vacuum, as illustrated in . 0.15 m P x The electric field strength at the surface of the sphere is 84 V m–1. Determine: the charge Q on the sphere Q = C the electric field strength at point P, a distance x = 0.45 m from the centre of the sphere. electric field strength = V m–1 Use information from to show, on the axes of , the variation of the electric field strength E with distance x from the centre of the sphere for values of x from x = 0 to x = 0.45 m. 0.1 0.2 0.3 0.4 0.5 x / m E / V m–1
9702_w20_qp_42
THEORY
2020
Paper 4, Variant 2
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Questions Discovered
13