Answer
(a) 2 and 4
Work Step by Step
In 2 and 4 magnitude of magnetic field by two wires is same but direction is opposite, so net magnetic field is zero at P.
Physics (10th Edition)
by Young, David; Stadler, Shane
Published by
Wiley
ISBN 10:
1118486897
ISBN 13:
978-1-11848-689-4
Chapter 21 - Magnetic Forces and Magnetic Fields - Focus On Concepts - Page 607: 16
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