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Chapter 14 - Electromagnetism - 3
1.
SI unit for measuring magnetic flux is called:
a) Weber
b) Maxwell
c) Oersted
d) Gauss
2.
If the magnetic flux is expressed in weber, then magnetic induction can be expressed as:
a) Weber-m
b) Weber-m
-2
c) Weber-m
2
d) Weber-m
-1
3.
The source of magnetic field is:
a) A current loop
b) An isolated south pole
c) A static electric charge
d) An isolated north pole
4.
A compass needle will be deflected if it is kept near a:
a) Charged body in motion
b) Stationary electron
c) Negatively charged body at rest
d) Positively charged body at
5.
The permeability of free space is;
a) 1/4px10
7
wb A
-1
m
-1
b) 4px10
-71
wb A
-1
m
-1
c) 1/4px10
-7
wb A
-1
1 m
-1
d) 4px10
7
wb A
-1
m
-1
6.
Magnetic material loses their magnetic properties when:
a) Dipped in water
b) Brought near a piece of iron
c) Heated
d) dipped in oil
7.
Which of the following scientist first discovered the magnetic effect of an electric current:
a) Faraday
b) Oersted
c) Henry
d) Gauss
8.
Force on current carrying conductor placed in uniform magnetic field is equal to:
a) IL x b
b) IL/B
c) IL x V
d) Iq x B
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