Electromagnetism

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Question 23
Medium

An aerospace researcher is testing a prototype electromagnetic actuator. As part of the calibration, a rigid, straight copper rod of length 0.35 m is suspended in a region of uniform magnetic field of flux density BBB.

A steady current of 4.0 A is passed through the rod, which is aligned at an angle of 30∘ 30^\circ\,30∘ relative to the magnetic field lines. Under these conditions, the magnetic force acting on the rod is measured to be 0.28 N.

The researcher calculates B B\,B to record in the calibration log.

Which row of the table correctly shows the SI heading for the column and the calculated value of BBB?

Table heading for BValue for BB/Wb0.40 \begin{array}{c|c} \textbf{Table heading for } B & \textbf{Value for } B \\ \hline B/\text{Wb} & 0.40 \end{array} Table heading for BB/Wb​Value for B0.40​​
Table heading for BValue for BB/T0.20 \begin{array}{c|c} \textbf{Table heading for } B & \textbf{Value for } B \\ \hline B/\text{T} & 0.20 \end{array} Table heading for BB/T​Value for B0.20​​
Table heading for BValue for BB/T0.40 \begin{array}{c|c} \textbf{Table heading for } B & \textbf{Value for } B \\ \hline B/\text{T} & 0.40 \end{array} Table heading for BB/T​Value for B0.40​​
Table heading for BValue for BB/Wb0.20 \begin{array}{c|c} \textbf{Table heading for } B & \textbf{Value for } B \\ \hline B/\text{Wb} & 0.20 \end{array} Table heading for BB/Wb​Value for B0.20​​

Electromagnetism Questions

  1. A Level
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