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Class 12 NEET Physics Moving Charges and Magnetism
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© examsnet.com
Question : 45
Total: 96
A thin ring of radius R meter has charge q coulomb uniformly spread on it. The ring rotates about its axis with a constant frequency of
f
revolutions/s. The value of magnetic induction in
W
b
/
m
2
at the centre of the ring is
(2010)
µ
0
q
f
2
π
R
µ
0
q
2
π
f
R
µ
0
q
2
f
R
µ
0
q
f
2
R
Validate
Solution:
Current produced due to circular motion of charge q is
I
=
q
f
.......(i)
Magnetic field induction at the centre of the ring of radius R is
B
=
µ
02
π
I
4
π
R
=
µ
0
I
2
R
=
µ
0
q
f
2
R
(Using(i))
© examsnet.com
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