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Determine an expression for the current in the ring
jumping ring demonstration, an electromagnet provides magnetic
field of B=0.2 cos 377t tesla over a circle of radius 1.2cm.
magnetic flux passes thru a copper ring of radius 1.5 cm and cross section 0.5 cm sqrd.
Find an expression for the current in the ring
a. Find the resistance of the copper ring
b. what is the emf induced in the ring
c. find an expression for the current in the ring
note : copper conductivity 5.8 X 10^7 S/m
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