NEET Class neet Answered
magnetic field linked through a coil of 50Ω resistance varying with time as shown in graph. Draw the graph of current v/s time.
(Given time in sec and flux in wb)
Asked by jhajuhi19 | 20 Aug, 2021, 12:32: PM
Expert Answer
Induced EMF , E = -dφ/dt
where φ is flux of magnetic field
Induced Current , E/R = - (1/R) ( dφ/dt )
where R is resistance of coil .
At time t = 0 to t = 2 s, induced Current = -(1/50) × [ (25)/2 ] = -0.25 A
At time t = 2 to t = 4 s, induced Current = 0 , because flux is constant
At time t = 4 to t = 6 s, induced Current = - (1/50) × [ ( -20 -25 ) / 2 ] = 0.45 A
Magnetic flux and induced current are plotted in figure as function of time
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