Q19 · 2022 · Paper 1Simple familiar1 mark
QUESTION 19
A current-carrying wire is placed perpendicular to two magnets. As the current in the wire is changed, the force acting on it is recorded.
The gradient of the line of best fit is proportional to the
(A)
potential difference.
(B)
electromotive force.
(C)
resistance of the wire.
(D)
magnetic field strength.
WORKED SOLUTION
1 markAnswer D
ANSWER
D
Worked solution
For a wire perpendicular to the field, . On a graph of against , the gradient is , so with fixed wire length it is proportional to magnetic field strength. Option D.
Selects option D.
Worked explanation by QCE Vault; correct option verified against the QCAA answer key.