Magnetic flux density and force on a conductor Quiz
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5 questions, one answer each
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1. A 0.25 m wire carries 4.0 A at right angles to a 0.30 T field. What is the force?
- A. 0.30 N
- B. 1.2 N
- C. 3.3 N
- D. 0.075 N
2. Which statement about the direction of the force on a current-carrying wire in a field is correct?
- A. It is along the current
- B. It is along the field
- C. It is perpendicular to both the current and the field
- D. It is opposite to the field
3. In Required practical 10 the magnet assembly rests on a balance. What does the balance reading change by when current flows?
- A. The weight of the wire
- B. F/g, from the equal and opposite force on the magnets
- C. The magnetic flux
- D. The voltage across the wire
4. A force of 0.060 N acts on 0.10 m of wire carrying 1.5 A at right angles to a field. What is B?
- A. 0.0090 T
- B. 2.5 T
- C. 0.40 T
- D. 0.060 T
5. A wire of weight 0.050 N floats because the upward magnetic force balances it. If the current is doubled, what is the initial resultant force?
- A. 0.050 N upwards
- B. 0.100 N upwards
- C. 0.050 N downwards
- D. Zero