HW6- induction Problem 21.09 Resources « previous | 10 of 17 | next » Problem 21

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HW6- induction Problem 21.09 Resources « previous | 10 of 17 | next » Problem 21.09 Part A A 30.0 cm x 60.0 cm rectangular circuit containing a 15.0 resistor is perpendicular to a uniform magnetic field that starts out at 2.50 T and steadily decreases at 0.280 T/s. (See (Figure 1).) While this field is changing, what d oes the ammeter read? Express your answer in milliamperes to two significant figures. I3.36.10 mA Submit My Answers Give Up Incorrect; Try Again; 8 attempts remaining Continue 4) Figure 1 of 1 x B 60.0 cm 30 15 cm

Explanation / Answer

A = area = 0.6 x 0.3 = 0.18 m2

R = 15 ohm

dB/dt = 0.280 T/s

induced emf is given as

E = A dB/dt

current is given as

i = E/R

i = A dB/dt /R

i = (0.18) (0.280)/15

i = 0.0034 A

i = 3.4 mA

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