An circular coil of radius R consists of N turns of wire.The current in the wire is I.Let B is the magnetic field at the center of the coil Which of the following is true?

An circular coil of radius R consists of N turns of wire.The current i

1.	An circular coil of radius R consists of N turns of wire.The current in the wire is I.Let B is the magnetic field at the center of the coil Which of the following is true?
A.	B=µ0NI/R
B.	B=µ0I/2R
C.	B=µ0NI/4R
D.	none of this
Answer» E.