Magnetism and Electromagnetism | Practice MCQs Physics for Mdcat | mosaicbro.com

Magnetism and Electromagnetism | Practice MCQs Physics for Mdcat

7 of 127 questions (Page 15 of 19)

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99 A charged particle moves through a magnetic field. The effect of the field is to change the particle’s:
Correct Answer: D
Explanation: Magnetic forces alter direction but not speed or energy.
100 The time required for a charged particle to make a complete revolution in a magnetic field does not depend upon:
Correct Answer: B
Explanation: Cyclotron period $T = 2\pi m/(qB)$ depends on $m$, $q$, $B$, not energy.
101 The radius of curvature of the path of a charged particle in a uniform magnetic field is directly proportional to:
Correct Answer: C
Explanation: Radius $r = p/(qB)$, where $p$ is momentum.
102 The fact that an electric field is produced in a conductor whenever magnetic lines of force moves it is referred to as:
Correct Answer: B
Explanation: Faraday’s law describes induced emf due to changing flux.
103 The unit of magnetic induction is:
Correct Answer: C
Explanation: Magnetic induction (flux density) is measured in Weber/m² (Tesla).
104 Transformers are not used in:
Correct Answer: B
Explanation: Transformers require changing flux, which DC cannot provide.
105 The direction of an induced current is such that it opposes the cause that produces it, is the statement of:
Correct Answer: B
Explanation: Lenz’s law defines the direction of induced current.
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