A positively charged particle is projected precisely parallel to a uniform magnetic field. The trajectory of the particle will be a: MCQ with Answer and Explanation

Question

A positively charged particle is projected precisely parallel to a uniform magnetic field. The trajectory of the particle will be a:

A. Circle

B. Helix

C. Straight line

D. Parabola

Answer: Option C

Solution (By JKSSB Mock Tests)

The magnetic Lorentz force on a moving charge is F = q(v x B) = qvBsin(theta). If the particle moves completely parallel to the magnetic field, the angle theta is 0 degrees. Since sin(0) = 0, the magnetic force is absolutely zero. Experiencing no transverse force, the particle continues moving in a perfect straight line.

This question belongs to: Science Physics

Request complete Subject PDF

Discuss this Question (0)

No comments yet. Be the first to start the discussion!

Practice More Physics Questions

Question #1

Share Report

Binding energy per nucleon peaks at:

A. Helium

B. Hydrogen

C. Iron

D. Uranium

View Answer & Solution Discuss

Get Complete Subject PDF for Science

Correct Answer: Option C

Explanation:
Maximum binding energy/nucleon ≈ 8.8 MeV at iron-56, making it most stable. Lighter nuclei release energy via fusion; heavier via fission. Memory tip: 'Iron peak: most stable nucleus; fusion before, fission after'. Nuclear physics concept frequently tested in competitive exams.

This question belongs to: Science Physics

Question #2

Share Report

A typical household refrigerator works by forcing a refrigerant fluid through a cycle of:

A. Ionization and recombination

B. Evaporation and condensation

C. Sublimation and deposition

D. Nuclear fission and fusion

View Answer & Solution Discuss

Get Complete Subject PDF for Science

Correct Answer: Option B

Explanation:
A refrigerator is a heat pump operating in reverse. A compressor squeezes the refrigerant gas, raising its temperature. As it passes through coils on the back (condenser), it releases heat and condenses into a liquid. This liquid expands through a valve, cooling rapidly, and flows into the evaporator coils inside the fridge, where it absorbs heat from the food and evaporates back into a gas.

This question belongs to: Science Physics