QCEVault

Electromagnetism — Question 169

Original QCE Vault practice · 5 marks

Q169 · Practice questionComplex unfamiliar5 marks

QUESTION 169 (5 marks)

A straight wire has 0.240 m0.240\,\mathrm m of its length in a uniform magnetic field. The angle between current and field is 30.0∘30.0^\circ. A force sensor gives readings FrawF_{\rm raw} as current II varies. The fitted graph is shown. Assume the sensor has a constant additive zero offset and the magnetic force is zero at I=0I=0.
Raw force in mN versus current in A. A fitted straight line has intercept 4.0 mN and passes through (4.0 A,18.4 mN).
a)
Determine the sensor zero offset and the gradient in SI units.
[2 marks]
b)
Determine the magnetic flux density.
[3 marks]
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