Deflecting a compass needle when you bring a current-carrying wire down onto the

Question

Deflecting a compass needle when you bring a current-carrying wire down onto the top of a compass, aligned with the original direction of the needle and 3 mm above the needle, the needle deflects by -19 degrees see the figure). BEarth (a) Which of the following statements are correct? Select all that apply Conventional current in the wire flows upward (North). Electron current in the wire is flowing upward (North) Conventional current in the wire is flowing downward (South) The magnetic field under the wire, due to the current, points to the West. The magnetic field under the wire, due to the current, points to the East. The magnetic field under the wire, due to the current, points North (b) Calculate the amount of conventional current flowing in the wire. The measurement was made at a location where the horizontal component of the Earth's magnetic field is BEarth 2 x 10-5 tesla 0328808X A

Explanation / Answer

a)

b)

From

Bwire =(2*10-5)tan19 =6.886*10-6 T

Magnetic field due to long straight wire is

Bwire=uoI/2pir

=>I=2pirB/uo =2pi*(3*10-3)*(6.886*10-6)/(4pi*10-7)

I=0.1033 A

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