Magnetic Field

F=BILsin theta

B=F/(LxI)

or

B= (4pi x 10^-7/2pi ) x (I/r)

hope it helps, B=magnetic field --- measured in [T] Tesla Magnetic field strength in a coil can be measured from the equation :-F=I*B*L Where, f=magnitude of Lorentz Force I=Current Flowing Through the Coil L=Length of the wire THE UNIT MAGNETIC FIELD STRENGTH IS 'TESLA' or Weber per metre sq.

http://en.wikipedia.org/wiki/Magnetic_field

http://en.wikipedia.org/wiki/Solenoid