D) 4.0 × 10-5 N attractive 21. Two long parallel wires carry currents of 3.0 A a

Question

D) 4.0 × 10-5 N attractive 21. Two long parallel wires carry currents of 3.0 A and 7.0 A in the same direction. The wires are separate 0.40 m. What is the magnitude magnetic field midway between the two wires? A) 1.0 x 10-7T B) 2.0 x 10-6 T C) 3.0 x 10-6 T D) 4.0 x 10-6 T E)1.0×10-5 T 22. If the current in the dark (large) loop is clockwise and decreasing: A) the induced currents in the inside loop is clockwise and the outside loop is counterclockwise. B) the induced currents in the inside loop is counterclockwise and the outside loop is counterclockwise C) the induced currents in the inside loop is counterclockwise and the outside loop is clockwise D the induced currents in the inside loop is clockwise and the outside loop is clockwise

Explanation / Answer

21) magnetic field due to stright wire B = mue*i/2pir

here current is passing the in the same direction

B tot = mue0*i1/2pi*r1-mue0*i2/2pi*r2

here r1 = r2 = 0.2 m

i1 = 7 A and i2 = 3 A

B tot = 4pi*10^-7/2pi(7/0.2-3/0.2)

Btot = 2*10^-7*20 = 40*10^-7

B tot = 4*10^-6 T

option D

22) according to lenz law

indiced current in inside loop is counter clock wise and out side loop is clock wise

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