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jlmessick88
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Homework Statement
A researcher would like to perform an experiment in zero magnetic field, which means that the field of the Earth must be cancelled. Suppose the experiment is done inside a solenoid of diameter 1.0 m, length 4.0 m, with a total of 5000 turns of wire. The solenoid is oriented to produce a field that opposes and exactly cancels the field of the earth. What current is needed in the solenoid’s wires?
Homework Equations
∑B ∆length = (µ0)I
The Attempt at a Solution
B = 5 * 10^-5 T
length = 4 m
radius = 0.5 m
i = [4*(5*10^-5)]/(5000*2*pie*0.5)
i = 1.27*10^-8
have i done this correctly at all??