When you bring a current-carrying wire down onto the top of a compass, aligned w

Question

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 theta = 15 degrees (see the figure). a) Which of the following statements are correct? Select all that apply. The magnetic field under the wire, due to the current, points to the East. Electron current In the wire is flowing upward (North). Conventional current in the wire flows 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 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 B_Earth = 2 times 10^-5 tesla. A

Explanation / Answer

step;1

Given that

angle =15 degree

distance d=3 mm

magnetic field B=2*10^-5 T

step;2

now we find the current in the wire

the magnetic field B=2*10^-7*i*cos(theta)/r

2*10^-5=2*10^-7*icos(15)/3*10^-3

3*10^-1=i*cos(15)

current I=0.31 A

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