and
are long parallel conductors separated by certain distance.
is the midpoint between them (see the figure). The net magnetic field at
is
. Now, the current
is switched off. The field at
now becomes
A
B
C
D
Text Solution
Verified by ExpertsThe correct answer is:
B
Magnetic field at midpoint in first case is
( and
are in opposite directions)
When the current is switched off, the net magnetic field at
is due to current
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