The cross-sectional area of an adjustable single loop is reduced from 1.2 m^2 to 0.40 m^2 in 0.25 seconds. What is the average emf that is induced in this coil if it is in a region where B = 1.5 T downward, and the coil's plane is perpendicular to B?
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Thus magnetic flux when area of cross section 1.2 sq m is
`phi= 1.5xx1.2 ` Wb
The magnetic flux ,when area of cross section .4 sq m is
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