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Manipal Entrance Test 2016 Physics Paper
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© examsnet.com
Question : 6
Total: 50
A current carrying coil is bent sharply so as to convert it into a double loop both carrying current in the same direction. If
B
be the initial magnetic field at the centre, then what will be the final concentric magnetic field?
2B
4B
8B
Zero
Validate
Solution:
Radius of the double loop,
r
=
R
2
where, R is the radius of single loop B (centre)
=
µ
0
4
π
.
2
π
I
R
So, magnetic field due to each coil is double of that due to single coil.
and total magnetic field = 2B + 2B = 4B
© examsnet.com
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