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A solenoid has 1000 turns per metre and carries 2 A. What is the field inside it? (mu0 = 4 pi x 10^-7)
A2.5 x 10^-4 T
B1.3 x 10^-3 T
C5.0 x 10^-3 T
D2.5 x 10^-3 T
Answer & Solution
Correct answer: D. 2.5 x 10^-3 T
B = mu0 n I = 4 pi x 10^-7 x 1000 x 2 = 2.5 x 10^-3 T.
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