QCEVault

Electromagnetism — Question 233

Original QCE Vault practice · 6 marks

Q233 · Practice questionComplex unfamiliar6 marks

QUESTION 233 (6 marks)

A horizontal wire of length 0.200 m0.200\,\mathrm m is supported by a force sensor in a uniform magnetic field directed into the page. The sensor reads the upward support force. With current 2.00 A2.00\,\mathrm A to the right, its reading is 0.310 N0.310\,\mathrm N. Reversing the current gives a reading of 0.470 N0.470\,\mathrm N. The wire stays at rest, and the whole stated length is in the field. Ignore forces on connecting leads. Use g=9.8 m s−2g=9.8\,\mathrm{m\,s^{-2}}.
A horizontal wire hangs from a force sensor. A rightward arrow labelled I follows the wire. A rectangular region with centred crosses denotes a uniform field into the page. The active wire length is 0.200 m. Not to scale.
a)
State the magnetic-force direction when the current is to the right.
[1 mark]
b)
Determine the magnetic field strength.
[3 marks]
c)
Determine the wire's mass.
[2 marks]
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