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physgrl
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Homework Statement
A 0.20 m long solenoid contains 1000 turns and carries a current of 5.0 A. What is the strength of the magnetic field at the center of the solenoid if its radius is 10-2m?
a. 35.1*10-1T
b. 8.2*10-1T
c. .95*10-2T
*d. 6.3*10-3T
Homework Equations
B=μo*nI/l
The Attempt at a Solution
B=(4∏*10^-7)*1000*5A/.2m
B=3.14x10^-2T
the answer key says its 6.3x10^-3T...what am I doing wrong?