A solenoid coil (in a robot) has a radius of 5.0 times 10^-3 m, and has 100 turn

Question

A solenoid coil (in a robot) has a radius of 5.0 times 10^-3 m, and has 100 turns of wire per inch of length. Electrons are flowing in the metal coil, producing a magnetic field of B = 3.3 times 10^-5 T as shown. Determine the direction of the electrons in the coil: a. Left side of drawing to Right side of drawing b. Right side of drawing to Left side of drawing Explain how you determined the answer ("wild guess" does not count as correct). The question does NOT ask about injecting electrons along the axis of the solenoid. One cannot treat the coil is if it were a solid metal rod: that would produce a significantly different magnetic field than the one shown. Lenz' law tells you about induced currents with changing magnetic flux, NOT the primary current with constant magnetic flux, so it does not apply to this question.

Explanation / Answer

9) b. Rightside to left drawing to left side of drawing.

10) Using right hand rule we can detemrine the direction of magnetic field.

curl your right hand fingers in the direction of current then your thumb indicates the direction of magnetic field.

here the direction of current from left to right.

so, the direction of electrons from right to left.

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