A long solenoid has 800 turns per meter length of solenoid. What is the magnatic induction at the end of the solenoid if it carries a current of 2.5 A?

Options

A. `6.28 xx 10^(-4)Wb//m^(2)`
B. `1.256 xx 10^(-3)Wb//m^(2)`
C. `3.14 xx 10^(-4)Wb//m^(2)`
D. `5 xx 10^(-4)Wb//m^(2)`

Answer

B

Explanation

`B=(mu_0nI)/2=(4pi xx 10^(-7) xx 800 xx 2.5)/2 =4pi xx 10^(-4)=1.256 xx 10^(-3)Wb//m^(2)`