Question: Three long, parallel, straight wires pass through the corners of an equilateral triangle of sides 10 cm as shown in Figure, where a dot means

Three long, parallel, straight wires pass through the corners of an equilateral triangle of sides 10 cm as shown in Figure, where a dot means that the current is out of the paper and a cross means that it is into the paper. If each current is 15.0 A, find

(a) The force per unit length on the upper wire, and

(b) The magnetic field B at the upper wire due to the two lower wires.

(X) (X) 10 cm 10 cm 10 cm

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