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Magnetic Force on a Wire Moving Inside a Magnetic Field. Lorentz Force Practice Questions

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The following physics revision questions are provided in support of the physics tutorial on Magnetic Force on a Wire Moving Inside a Magnetic Field. Lorentz Force. In addition to this tutorial, we also provide revision notes, a video tutorial, revision questions on this page (which allow you to check your understanding of the topic) and calculators which provide full, step by step calculations for each of the formula in the Magnetic Force on a Wire Moving Inside a Magnetic Field. Lorentz Force tutorials. The Magnetic Force on a Wire Moving Inside a Magnetic Field. Lorentz Force calculators are particularly useful for ensuring your step-by-step calculations are correct as well as ensuring your final result is accurate.

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Questions
16.4Magnetic Force on a Wire Moving Inside a Magnetic Field. Lorentz Force

Magnetic Force on a Wire Moving Inside a Magnetic Field. Lorentz Force Revision Questions

1) A single proton having a velocity of 2 × 105 m/s enters a 200mT uniform magnetic field at 300 to the field lines as shown in the figure.

Physics Tutorials: This image provides visual information for the physics tutorial Magnetic Force on a Wire Moving Inside a Magnetic Field. Lorentz Force

What is the magnitude and direction of magnetic force produced on the proton? Take cos 30° = 0.866 and sin 30° = 0.500 if necessary. The magnitude of an elementary charge is 1.6 × 10-19 C.

  1. 3.2 × 10-15 N out of page
  2. 5.54 × 10-15 N out of page
  3. 3.2 × 10-15 N onto the page
  4. 5.54 × 10-15 N onto the page

Correct Answer: C

2) An object having a charge of + 6.4 × 10-17 C enters a 2μT magnetic field at 105 m/s as shown in the figure.

Physics Tutorials: This image provides visual information for the physics tutorial Magnetic Force on a Wire Moving Inside a Magnetic Field. Lorentz Force

What is the radius of curvature of the charge's trajectory inside the magnetic field?

(Take mp = 1.67 × 10-27 kg, me = 9.1 × 10-31 kg and e = 1.6 × 10-19 C if necessary).

  1. 0.29 m
  2. 400 m
  3. 1.39 m
  4. 557 m

Correct Answer: D

3) What is the magnitude of the net force acting on a + 3μC charge when it enters at 2000 km/s inside normal to the frame obtained by a parallel plate capacitor and two bar magnets that produce a 5 mT magnetic field as shown in the figure? The capacitor plates are 2 cm apart and there is a potential difference of 100 V between them.

Physics Tutorials: This image provides visual information for the physics tutorial Magnetic Force on a Wire Moving Inside a Magnetic Field. Lorentz Force
  1. 0.015 N
  2. 0.030 N
  3. 0.045 N
  4. 0.060 N

Correct Answer: C

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