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Choose the correct alternative: A stra...

Choose the correct alternative:
A straight conductor of length lm carrying a current IA is bent in the form of a semicircle. The magnetic field (in tesla) at the centre of the semicircle is

A

`(pi^(2)I)/(l)xx 10^(-7)`

B

`(piI)/(l)xx 10^(-7)`

C

`(piI)/(l^(2))xx 10^(-7)`

D

`(piI^(2))/(l)xx 10^(-7)`

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