Problem 20.49 Two long, straight parallel wires are 10.0 cm apart and carry 4.80

Question

Problem 20.49 Two long, straight parallel wires are 10.0 cm apart and carry 4.80 A currents in the same direction (see (Figure 1) 1 of 1 Part A Find the direction of the magnetic field atpoint PI, midway between the wires. The field is zero. Subrnt MLAnswerR Give Up Correct Part B Find the magnitude ofthe magnetc field atpointP,midway between the wires Express your answer in telsas to three significant figures. My Answers Give Up Part C Find the direcson or the magnetic field at point p, 310 cm to the right of P The field is directed up My Answers Give Up Correct

Explanation / Answer

A) magnetic field is zero. so, no direction.

B) zero. The wires produce eqal and opposite magnetic fields at mid point.)

C) upward

D)
B2 = mue*I/(2*pi*r1) - mue*I/(2*pi*r2)

= (mue*I/(2*pi))*(1/r1 - 1/r2)

= (4*pi*10^-7*4.8/(2*pi))*(1/(0.31 - 0.05) - 1/(0.31 + 0.05))

= 1.02*10^-6 T

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