010 points | Previous Answers SerPOPS 23.P.003 My Notes Ask Your Teacher A flat

Question

010 points | Previous Answers SerPOPS 23.P.003 My Notes Ask Your Teacher A flat loop of wire consisting of a single turn of cross-sectional area 8.20 cm2 is perpendicular to a magnetic field that increases uniformly in magnitude from 0.500 T to 2.50 T in 0.98 s. What is the resulting induced current if the loop has a resistance of 2.50 07 6.690-3 Your response'is off by a multiple of ten. mA Need Help? Resd h 0/10 points ! Previous Answers SerPOP5 23 P009 w My Notes Ask Your Teache A 31-turn circular coil of wire has diameter 0 93 m. It is placed with its axis along the direction of the Earth's magnetic field of 56.0 and then in 0.200 s is flipped 180°. An average emf of what magnitude is generated in the coil? 11.8e-3

Explanation / Answer

E = dphi/dt

= ((2.5 - 0.5) * 8.2 * 10-4) / (0.98) = 1.67 * 10-3 V

I = E / R = 1.67 * 10-3 V / 2.5

= 6.69 * 10-4 A

induced current = 0.669 mA

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E = N A [ B cos 0 - B cos 180] / dt

= 2 N B A / dt   

E = (2 * 31 * 56 * 10-6 * pi * 0.4652) / (0.2)

E = 0.0118 V

= 11.8 mV

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