Physics 9702/43 — May/June 2023

Cambridge A-Level · A Level Structured Questions · worked solutions for every part, with the mark scheme

questions

100

marks

120

minutes

Topics Gravitational Fields · Electric Fields · Motion in a Circle · Oscillations · Temperature · Ideal Gases · +8 more

Q1Gravitational FieldsElectric FieldsFree sample

(a)

(i)

Define gravitational field.

(ii)

Define electric field.

(iii)

State one similarity and one difference between the gravitational potential due to a point mass and the electric potential due to a point charge.

similarity: ______

difference: ______

(b)

An isolated uniform conducting sphere has mass $M$ and charge $Q$ .
The gravitational field strength at the surface of the sphere is $g$ .
The electric field strength at the surface of the sphere is $E$ .

(i)

Show that

\frac{M}{Q} = \alpha \frac{g}{E}

where $\alpha$ is a constant.

(ii)

Show that the numerical value of $\alpha$ is $1.35 \times 10^{20}\ \text{kg}^2 \text{C}^{-2}$ .

(c)

Assume that the Earth is a uniform conducting sphere of mass $5.98 \times 10^{24}\ \text{kg}$ .
The surface of the Earth carries a charge of $-4.80 \times 10^5\ \text{C}$ that is evenly distributed.

(i)

Use the information in (b) to determine the electric field strength at the surface of the Earth. Give a unit with your answer.

electric field strength = ______ unit ______

(ii)

State how the direction of the electric field at the surface of the Earth compares with the direction of the gravitational field.

The rest of this paper

9 more questions

Q2Motion in a Circle · Oscillations12M
Q3Temperature11M
Q4Ideal Gases · Thermodynamics12M
Q5Alternating Currents · Capacitance9M
Q6Magnetic Fields10M
Q7Quantum Physics9M
Q8Medical Physics8M
Q9Nuclear Physics9M
Q10Astronomy and Cosmology9M

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