How many NESA Physics questions cover The Motor Effect?

AusGrader has 43 NESA Physics questions on The Motor Effect, all with instant AI grading and detailed marking feedback.

HSC Physics — The Motor Effect Questions & Answers

An experiment was conducted to determine the force experienced by an 85 cm wire with a 2.4 A current flowing through it in an external magnetic field. It was rotated through varying angles within the magnetic field such that data analysis identified the relationship $F = 0.0306 \sin \theta$ .

What is the order of magnitude of the strength of the external magnetic field?

$10^{-4}$ T

$10^{-2}$ T

$10^{2}$ T

$10^{4}$ T

Reveal Answer

$10^{-4}$ T

This value is too small. The calculated magnetic field strength is approximately $0.015 \text{ T}$ , which is two orders of magnitude larger than $10^{-4} \text{ T}$ .

$10^{-2}$ T

Correct Answer

Comparing the experimental relationship $F = 0.0306 \sin \theta$ to the theoretical formula $F = ILB \sin \theta$ , we see that $ILB = 0.0306$ . Solving for $B$ gives $B = \frac{0.0306}{2.4 \times 0.85} \approx 0.015 \text{ T}$ , which is on the order of $10^{-2} \text{ T}$ .

$10^{2}$ T

This value is significantly larger than the actual magnetic field. The calculation yields $B \approx 0.015 \text{ T}$ , whereas $10^2 \text{ T}$ represents an extremely strong magnetic field not supported by the data.

$10^{4}$ T

This value is far too large. The calculated field strength is approximately $1.5 \times 10^{-2} \text{ T}$ , which is six orders of magnitude smaller than $10^4 \text{ T}$ .

NESA Physics The Motor Effect

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