Question

Two long straight current-carrying wires run parallel to each other. The current in one of the wires is 4.9 A, their separation is 3.6 cm and they repel each other with a force per unit length of 2.5 10-4 N/m.

(a) Determine the current in the other wire.____ A

(b) Determine if the currents are in the same or opposite direction.

(c) Determine what will happen if the direction of one current is reversed and tripled. (Select all that apply.)

The wires are repelled by each other.

The force per unit length is increased by a factor of 3.

The wires are attracted to each other.

The force per unit length is decreased by a factor of 3

Answer #1

Solution in the uploaded image

Wires carrying current can attract or repel each other. two
wires are parallel but carry current in opposite directions.
I1 = 5 A,
I2 = 8 A
Distance between wires = 30 cm
Find the force per unit length on either wire
A.) 3.4 x 10^-5 N attractive
B.) 2.7 x 10^-5 N repulsive
C.) 2.7 x 10^-5 N attractive
D.) 7.2 x 10^-5 N repulsive
E.) 7.2 x 10^-5 N attractive

Magnetic Field due to a Current
Show that two straight wires running parallel to each other,
each carrying the same current I, exert forces on each
other.
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(b) Find the force, and distinguish the two cases (i)
currents parallel, and (ii) currents antiparallel.
(c) What is the force per unit length if I = 1
A, and the wires are 1 cm apart?

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attractiverepulsive

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