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JEE Mains 29-Jan-2023 Shift 2 Solved Paper
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© examsnet.com
Question : 12
Total: 90
The electric current in a circular coil of four turns produces a magnetic induction
32
T
at its centre. The coil is unwound and is rewound into a circular coil of single turn, the magnetic induction at the centre of the coil by the same current will be :
[29-Jan-2023 Shift 2]
8
T
4
T
2
T
16
T
Validate
Solution:
B
=
µ
0
i
2
R
×
4
B
′
=
µ
0
i
2
R
′
R
′
=
4
R
B
′
=
µ
0
i
8
R
B
′
B
=
1
16
B
′
=
2
T
© examsnet.com
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