Magnetic fields and forces Quiz
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5 questions, one answer each
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1. A 0.20 m wire carries 4.0 A at right angles to a 0.15 T field. What is the force on it?
- A. 0.12 N
- B. 0.75 N
- C. 0.030 N
- D. 5.3 N
2. A positive charge moves to the right in a field directed into the page. Using Fleming's left-hand rule, which way is the force?
- A. Down the page
- B. Up the page
- C. Into the page
- D. To the right
3. What happens to the kinetic energy of a charged particle moving at right angles to a uniform magnetic field?
- A. It increases steadily
- B. It decreases steadily
- C. It stays constant
- D. It falls to zero
4. A 100-turn coil of area 2.0 × 10⁻³ m² has its normal parallel to a 0.50 T field. What is its flux linkage?
- A. 1.0 × 10⁻³ Wb (turns)
- B. 0.10 Wb (turns)
- C. 5.0 × 10⁻³ Wb (turns)
- D. 1.0 × 10⁻¹ T
5. A wire carries a current at 90° to a field, then is rotated so that the current is at 30° to the field. By what factor does the force change?
- A. × 2
- B. × 0.87
- C. × 0.50
- D. × 0.00