Two long, straight parallel wires are 10.0cm apart and carry 4.80A currents in t

Question

Two long, straight parallel wires are 10.0cm apart and carry 4.80A currents in the same direction.

A. Find the direction of the magnetic field at point P1, midway between the wires. ANSWER: ZERO

B. Find the magnitude of the magnetic field at point P1, midway between the wires. ANSWER: O T

C. Find the direction of the magnetic field at point P2, 27.0cm to the right of P1. ANSWER: Directed to top of page.

Two long, straight parallel wires are 10.0cm apart and carry 4.80A currents in the same direction. A. Find the direction of the magnetic field at point P1, midway between the wires. ANSWER: ZERO B. Find the magnitude of the magnetic field at point P1, midway between the wires. ANSWER: O T C. Find the direction of the magnetic field at point P2, 27.0cm to the right of P1. ANSWER: Directed to top of page. D. Find the magnitude of the magnetic field at point P2, 27.cm to the right of P1. HELP?

Explanation / Answer

B = ??I/2?r

(1) Since the current is moving in the same direction, the magnetic field at mid-point between the two wires cancels each other out. Thus, B = 0.

2)Since the current is moving in the same direction, the magnetic field at mid-point between the two wires cancels each other out. Thus, B = 0

3)At P2, the 2 magnetic fields are additive

B1 = (4?x10^-7)(4.8)/2?(0.17) =9.6*10^-7/0.17=56.4*10^-7
B2 = (4?x10^-7)(4.8)/2?(0.26) =9.6*10^-7/0.26=36.9*10^-7

B(net) = 9.2x10^-6 Tesla

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