The magnetic field at the center of a 1.0-cm-diamcter loop is 6 mT What is the c

Question

The magnetic field at the center of a 1.0-cm-diamcter loop is 6 mT What is the current in the loop? Two concentric current loops lie in the same plane. The smailer loop has a radius of 3.0 cm and a current of 12 A. The bigger loop has a current of 20 A. The magnetic field at the center of the loops is found to he zero. What is the radius of the bigger loop? What are the magnetic field strength and direction at points 1 and 2 shown in the figure The two insulated wires in the figure cross at a 30 degree angle hut do not make electrical contact Each wire carries a 5.0 A current. Points 1 and 2 are each 4.0 cm from the intersection and equally distance from both wires What are the magnitude and direction of the magnetic field at points 1 and 27

Explanation / Answer

1)   Given diameter of loop   d = 1 cm radius of loop   R = d / 2   = 0.5 cm magnitude of magnetic field at the center of loop is   B = 6 mT   = 6 *10-3 T          magnetic field at the center of loop is                   B = o I / 2 R                    6*10-3 T     = ( 4*10-7 ) I / 2 (0.5*10-2 m )      current in the loop is                     I =   (6*10-3 T ) 2(0.5*10-2 m )     / ( 4*10-7 )                        = 47.74 A please post one question per one post

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