Magnetic induction due to semi infinite wire when point lies opposite to one end DIN None of these (A) 4πd (B) 1102 2πd (C) 3rd rotation is
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Answer:
Correct option is
A
1
As point O is along the length of segments L and M, so the field at O due to these segments will be zero.
Also, point O is near one end of a long wire.
The resultant field at O, B
R
=B
P
+B
Q
, this field willbe into the plane paper.
⇒B
R
=
4π
μ
0
RO
I
+
4π
μ
0
SO
I
But, RO=SO=0.02m
Hence, B
R
=2×
4π
μ
0
×
0.02
10
=2×10
−7
0.02
10
=10
−4
Wb m
−2
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