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Magnetic Force on a Current Carrying Wire. Ampere's Force Practice Questions

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16.3Magnetic Force on a Current Carrying Wire. Ampere's Force

Magnetic Force on a Current Carrying Wire. Ampere's Force Revision Questions

1) A 12 cm long metal bar is suspended by two identical springs of constants equal to 4 N/m each. This system is inserted inside a 50 mT magnetic field directed onto the page. If the mass of the bar is negligible and a 20 A current Is flowing through it, calculate the maximum extension produced in the springs. Remember the equivalent spring constant k of a parallel system of springs is k = k1 + k2.

Physics Tutorials: This image provides visual information for the physics tutorial Magnetic Force on a Current Carrying Wire. Ampere's Force
  1. 1.5 cm
  2. 3 cm
  3. 6 cm
  4. 12 cm

Correct Answer: A

2) Two identical current carrying metal bars being 8 cm long each are used to connect the detached parts of an electric circuit supplied by a 12 V battery. The wires are parallel, placed 10 cm apart as shown in the figure.

Physics Tutorials: This image provides visual information for the physics tutorial Magnetic Force on a Current Carrying Wire. Ampere's Force

What magnetic force is acting between the bars if the total resistance of the circuit is 20 ohms?

  1. 9.33 × 10-8 pushing force
  2. 5.76 × 10-8 pushing force
  3. 5.76 × 10-8 pulling force
  4. 9.33 × 10-8 pulling force

Correct Answer: C

3) A 8A current carrying rectangular coil is placed inside two magnets the opposite poles of which face each other. The coil fits perfectly the dimensions of the space between the two magnets as shown in the figure.

Physics Tutorials: This image provides visual information for the physics tutorial Magnetic Force on a Current Carrying Wire. Ampere's Force

What is the direction of magnetic field between the magnets if the maximum torque produced is 3 × 10-3 N ∙ m?

  1. 25 T
  2. 2.5 T
  3. 2.5 mT
  4. 25 mT

Correct Answer: D

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