Magnetic flux density and magnetic forces Quiz
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5 questions, one answer each
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1. A wire of length 0.50 m carries 3.0 A at 90° to a field of 0.20 T. What is the force on the wire?
- A. 0.060 N
- B. 0.30 N
- C. 0.75 N
- D. 1.2 N
2. The flux through each turn of a coil of 200 turns is 2.5 × 10⁻³ Wb. What is the flux linkage?
- A. 1.25 × 10⁻⁵ Wb turns
- B. 2.5 × 10⁻³ Wb turns
- C. 0.50 Wb turns
- D. 80 Wb turns
3. Which statement about the magnetic force on a charged particle is correct?
- A. It increases the particle's kinetic energy
- B. It acts parallel to the velocity
- C. It is zero when the particle moves parallel to the field
- D. It is largest when the particle moves parallel to the field
4. A coil has area 5.0 × 10⁻³ m² in a field of 0.40 T. The normal to the coil is at 60° to the field. What is the flux through the coil?
- A. 2.0 × 10⁻³ Wb
- B. 1.0 × 10⁻³ Wb
- C. 1.7 × 10⁻³ Wb
- D. 8.0 × 10⁻³ Wb
5. An alpha particle (charge +2e) moves at 90° to a field of 0.30 T at 1.5 × 10⁶ m s⁻¹. The force on it is
- A. 1.4 × 10⁻¹³ N
- B. 7.2 × 10⁻¹⁴ N
- C. 2.4 × 10⁻¹⁴ N
- D. 4.8 × 10⁻¹³ N