alleryStart learning →A 0.5 m solenoid has 400 turns and carries 2.5 A. The inside field is about:
A1.26 x 10^-3 T
B2.5 x 10^-3 T
C5 x 10^-3 T
D6.3 x 10^-4 T
Answer & Solution
Correct answer: B. 2.5 x 10^-3 T
n = 400/0.5 = 800 per m, so B = 4 pi x 10^-7 x 800 x 2.5 = 2.5 x 10^-3 T.
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