Answer all the questions in the spaces provided. (a) State the SI base units of force. (b) Two wires each of length $l$ are placed parallel to each other a distance $x$ apart, as shown in Fig. 1.1. Each wire carries a current $I$. The currents give rise to a force $F$ on each wire given by $$ F = \frac{KI^2l}{x} $$ where $K$ is a constant. (i) Determine the SI base units of $K$. units of $K$ = \_\_\_\_\_\_ (ii) On Fig. 1.2, sketch the variation with $x$ of $F$. The…

Physics 9702/23 — May/June 2013

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

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Topics Work, Energy and Power · Physical Quantities and Units · Kinematics · Dynamics · Deformation of Solids · Superposition · +4 more

Q1Physical Quantities and UnitsFree sample

Answer all the questions in the spaces provided.

(a)

State the SI base units of force.

(b)

Two wires each of length $l$ are placed parallel to each other a distance $x$ apart, as shown in Fig. 1.1.

Fig. 1.1

Each wire carries a current $I$ . The currents give rise to a force $F$ on each wire given by

F = \frac{KI^2l}{x}

where $K$ is a constant.

(i)

Determine the SI base units of $K$ .

units of $K$ = ______

(ii)

On Fig. 1.2, sketch the variation with $x$ of $F$ . The quantities $I$ and $l$ remain constant.

Fig. 1.2

(iii)

The current $I$ in both of the wires is varied.
On Fig. 1.3, sketch the variation with $I$ of $F$ . The quantities $x$ and $l$ remain constant.

Fig. 1.3

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