Problem 28.16 Two long, straight, parallel wires, 10.0 cm apart carry equal 4.00

Question

Problem 28.16 Two long, straight, parallel wires, 10.0 cm apart carry equal 4.00-A currents in the same direction, as shown in the figure (Figure 1) Fig of 1 Part A Find the magnitude of the magnetic field at point midway between the wires. 0 T My Answers Give Up Correct Part B What is its direction? o to the left o to the right o upward a downward o no field submit My Answers Give Up Part C Find the magnitude of the magnetic field at point tz 25.0 cm to the right of Submit My Answers Give Up incorrect Try Again 4 attempts remaining Part D What is its direction? o to the left o to the right upward downward o no field Submit My Answers Give Up Part E Find the magnitude of the magnetic field at point ra 20.0 cm directly above r1

Explanation / Answer

a)

at the midway , as the magnetic field due to both wires oppose each other ,

magnetic field will cancel each other

and the magnitude of magnetic field is Zero

part B)

as there is no field

no field

part C)

current , I = 4 A

as the magnetic field due to both wires will add up

Bnet = B1 + B2

Bnet = u0*I/(2*pi*0.25) + u0*I/(2*pi*0.35)

Bnet = 4pi*10^-7 * 4 /(2pi) *(1/.25 + 1/.35)

solving for Bnet

Bnet = 5.49 *10^-6 T

the magnetic field is 5.49 *10^-6 T

D)

direction of field is upwards

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