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Physics — Question 12

QCAA 2025, Paper 1 · 1 mark

Q12 · 2025 · Paper 1Simple familiar1 mark

QUESTION 12

A wire with a length of 0.2 m and a current of 2.4 A is placed in an external uniform magnetic field of 1.5 mT, as shown. Its angle, θ\theta, is varied from 0∘0^\circ to 90∘90^\circ.
As the angle θ\theta changes from 0∘0^\circ to 90∘90^\circ, the magnetic force will
Official QCAA diagram or graph for Physics 2025 Paper 1 Question 12.
(A)
remain zero.
(B)
remain 7.2×10−47.2\times10^{-4} N.
(C)
start at zero and increase to 7.2×10−47.2\times10^{-4} N.
(D)
start at 7.2×10−47.2\times10^{-4} N and decrease to zero.
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