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KEAM 2010 Physics and Chemistry Paper
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© examsnet.com
Question : 6
Total: 119
A
2
µ
C charge moving around a circle with a frequency of
6.25
×
10
12
H
z
produces a magnetic field
6.28
T
at the centre of the circle. The radius of the circle is
2.25
m
0.25
m
13.0
m
1.25
m
3.25
m
Validate
Solution:
Given,
q
=
2
µ
C
=
2
×
10
−
6
C
f
=
6.25
×
10
12
H
z
B
=
6.28
T
The magnetic field at the centre of the circle
B
=
µ
0
i
2
r
=
µ
0
q
f
2
r
[
∵
i
=
q
f
]
6.28
=
4
π
×
10
−
7
×
2
×
10
−
6
×
6.25
×
10
12
2
r
or
r
=
4
π
×
10
−
7
×
2
×
10
−
6
×
6.25
×
10
12
6.28
×
2
=
1.25
m
© examsnet.com
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