Magnetism and Electromagnetism | Practice MCQs Physics for Mdcat | mosaicbro.com
Magnetism and Electromagnetism | Practice MCQs Physics for Mdcat
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Review Answers:
1
The sources of magnetic field are:
Correct Answer:C
Explanation:
Magnetic fields are produced by moving charges (currents), not isolated poles or stationary charges.
2
A current carrying straight conductor is placed in a magnetic field perpendicular to it. The force experienced by the conductor is:
Correct Answer:A
Explanation:
The force on a current-carrying conductor in a perpendicular magnetic field is $F = BIL$.
3
The standard vector symbol for flux density is:
Correct Answer:B
Explanation:
The symbol for magnetic flux density is $B$.
4
Flux density is measured in:
Correct Answer:B
Explanation:
Flux density is measured in Webers per square meter ($\text{Wb/m}^2$).
5
Gauss (G) is smaller unit of magnetic induction which is related to tesla (T) as:
Correct Answer:A
Explanation:
1 Tesla = $10^4$ Gauss, so $G = 10^{-4} T$ (note: the options seem incorrect; the closest standard relation is $1 T = 10^4 G$).
6
A 2m length of a wire is carrying a current of 3 amperes at right angles to uniform magnetic field of 0.4 weber/m². The force on this length of wire is:
Correct Answer:A
Explanation:
Using $F = BIL = 0.4 \times 3 \times 2 = 2.4$ N.
7
The force acting on a charge moving in a magnetic field:
Correct Answer:D
Explanation:
The magnetic force $\vec{F} = q\vec{v} \times \vec{B}$ satisfies all these conditions.