ENTRANCE TEST 2012

Q: A 10 cm long solenoid has 100 turns. What will be the magnetic field inside it along its axis if
one micro ampere current is passed through it?

(a) :  4π x 10^-13 tesla
(b) :   4π x 10^-7 tesla
(c) :   4π x 10^-10 tesla
(d) :   4π x 10^-16 tesla
Answer:   4π x 10^-10 tesla
Explanation:  

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