Question

Three long, straight and parallel wires carrying currents are arranged as shown in figure. The force experienced by 10 cm length of wire Q is ____________.

विकल्प

• 4 x 10^-5 N towards the right

• 4 x 10^-5 N towards the left

• 2.6 x 10^-4 N to the right

• 2.6 x 10^-4 N to the left

Answer 1

Three long, straight and parallel wires carrying currents are arranged as shown in figure. The force experienced by 10 cm length of wire Q is 4 x 10^-5 N towards the right.

Explanation:

Force on wire Q due to wire P is

`"F"_"P" = 10^-7 xx (2 xx 40 xx 10)/0.05 xx 0.1`

`= 16 xx 10^-5 "N"  "(Towards left)"`

Force on wire Q due to wire R is

`"F"_"R" = 10^-7 xx (2 xx 20 xx 10)/0.02 xx 0.1`

`= 20 xx 10^-5 "N"  "(Towards right)"`

`"F"_"net" = "F"_"R" - "F"_"P"`

` = 4 xx 10^-5 "N"  "(Towards right)"`