12. A wire is kept parallel to a square coil. Both carry cur-
rent of same amount. If the magnetic field due to the
wire at any point P with in the coil is B,, then the total
magnetic induction B at P will be:
(C
i
17. An
• Р
rac
the
cer
(A) B=0
(C) BB
PB) B > B,
(D) B = B.
(A
Answers
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0
Answer
B
QR
=
B
SP
and are −
k
^
direction.
B
PQ
and
B
RS
are in −
k
^
direction.
Magnetic field due to the long wire is also in −
k
^
direction.
Since all are in the same direction, magnetic field at point P( center of the coil) is more than that produced by the coil.
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