A long wire carries a current of 220 mA What is the magnitud

A long wire carries a current of 220 mA. What is the magnitude of the magnetic field 0.018 cm from the wire? 0.0002886 T 0.0002480 T 0.0002131 T 0.0002444 T 0.0002253 T 0.0002321 T Two long, parallel wires carry currents of 0.242 A in the same direction. If the wires are 0.031 m apart, what is the force per unit length between the wires? Is this force attractive or repulsive? 2.932E-07 n/m 4.417E-07 n/m 3.778E-07 n/m 3.020E-07 n/m 3.801E-07 n/m 3.387E-07 n/m Attractive Repulsive

Solution

According to the given problem,

17.) As the magnetic field is given by,

B = µo*I/2r where µo/2 = 2.0x10^-7, r = 1.8 *10^-4m, I = 0.22A

B = 2*10^-7*0.22/1.8 *10^-4

B = 2.44*10^-4 T [d]

18.)Force per unit length

F = µo*I²/2r, where µo/2 = 2.0x10^-7, r = 0.031m, I = 0.242A

F = 2*10^-7*0.242²/0.031 N

F = 3.778 *10^-7N/m [c]

19.) The force is attraction, [A]

As the current is moving in same direction and using right-hand rule to determine the force direction in wire1. its towards the wire2 , same for same fot wire2 its towards wire1