A wire carries a current of 13 A . FieldsourceandlocationFieldstrength(T)10 cm f

Question

A wire carries a current of 13 A .

FieldsourceandlocationFieldstrength(T)10 cm from a wire with 1 Acurrent2× 106Surface of the earth5× 1051 cm from a wire with 10 Acurrent2× 104Refrigerator magnet5× 103100-turn coil, 1 cm diameter, with 1 A current1× 102Surface of the sun, in a sunspot1× 101Near a rare-earth magnet1MRI solenoid1

Use the data from table to determine at what approximate distance from the wire the magnetic field strength would equal that of a refrigerator magnet.

Express your answer to two significant figures and include the appropriate units.

Explanation / Answer

a) B = 2kI/r = 2*10^-6 T
b) r = 51 cm
B = 3.9215*10^-7 T
c) n = 3100
A = pi*0.005^2
I = 1 A
B = 2*pi*k*n*I/r = 0.38936 T

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