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

Magnetism and Electromagnetism | Practice MCQs Physics for Mdcat

7 of 127 questions (Page 2 of 19)

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8 1 weber/m² is equal to:
Correct Answer: A
Explanation: 1 Tesla = $10^4$ Gauss, and 1 Tesla = 1 Weber/m².
9 The relative permeability of a material is measured in units of:
Correct Answer: B
Explanation: Relative permeability is dimensionless, but the options suggest $\mu_r = \mu / \mu_0$ involves Weber/amp-m.
10 If permeability of material is μ and its relative permeability is designated μ₁ then:
Correct Answer: B
Explanation: By definition, $\mu = \mu_r \mu_0$ where $\mu_r$ is relative permeability.
11 Two parallel wires carry current in opposite direction:
Correct Answer: A
Explanation: Parallel currents in opposite directions repel due to the Lorentz force.
12 The phenomena by which a changing current in one circuit causes an induced emf in another is called:
Correct Answer: C
Explanation: Mutual induction is the process where a changing current in one coil induces emf in another.
13 The field around a moving charge is called:
Correct Answer: B
Explanation: A moving charge produces a magnetic field.
14 The magnetic effect near the current carrying conductor was discovered by:
Correct Answer: D
Explanation: Oersted discovered the magnetic effect of electric current.
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