Magnetics 4 Question 11
12. When but wires are not touching the loop, it is found that the net magnetic field on the axis of the loop is zero at a height above the loop. In that case
(a) current in wire 1 and wire 2 is the direction
(c) current in wire 1 and wire 2 is the direction
(d) current in wire 1 and wire 2 is the direction
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Answer:
Correct Answer: 12. (c)
Solution:
due to ring
In magnitudes,
Resultant of
For zero magnetic field at