Please answer 4!! b) 0.2T c) unchanged. d) None of these. 4. A 10-turn square co

Question

Please answer 4!! b) 0.2T c) unchanged. d) None of these. 4. A 10-turn square coil of area 0.036 m2 and a 20-turn circular coil are both placed perpendicular to the same changing magnetic field. The voltage induced in each of the coils is the same. What is the area of the circular coil? 5. A vertically placed coaxial cable of outside diameter 1 cm has a upward and 4 amps on the outside cylinder directed downward of the cable center current of 5 amps directed . What is the B field 0.5 m from the axis

Explanation / Answer

4)

for square loop

Area A1 = 0.036 m^2

number of turns N1 = 10

magnetic flux = N1*B1*A1

induced emf e1 = rate of change in flux

e1 = N1*A1*dB1/dt

for cuircular loop

Area A2 = ?

number of turns N2 = 20

magnetic flux = N2*B2*A2

induced emf e2 = rate of change in flux

e2 = N2*A2*dB2/dt

given e2 = e1

and dB1/dt = dB2/dt

N2*A2 = N2*A2

20*A2 = 10*0.036

area of circular coil A2 = 0.018 m^2 <<<--------ANSWER

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