Three long straight wires carrying current are arranged mutually parallel as shown in the figure. The force experienced by 15 cm length of wire 
is 
. ( 
)
A
towards 
B
towards 
C
towards 
D
towards 
Text Solution
Verified by ExpertsThe correct answer is:
D
The force per unit length between parallel wires is 
.
Force on Q from P (opposite currents, repulsive towards R): 
.
Force on Q from R (same currents, attractive towards R ): 
.
Total force per unit length towards R: 
.
For 0.15 m length: 
towards R.
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