Two Long,straight Parallel Wires 7

Multiple Choice

Two long,straight parallel wires 7.6 cm apart carry currents of equal magnitude I.They attract each other with a force per unit length of 4.3 nN/m.The current I is approximately

A) 1.6 mA
B) 40 mA
C) 37 mA
D) 59 mA
E) 4.0 mA