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Q.

A circular coil having an area of 3.14 × 10-2 m2 and 30 turns is rotated about its vertical diameter with an angular speed of 70 rad-1 in a uniform horizontal magnetic field of magnitude 5 × 10-2 T. If the coil forms a closed loop of resistance 15 Ω, what is the average power loss due to Joule heating?

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a

0.360

b

0.362

c

0.724

d

0.726

answer is B.

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Detailed Solution

Given: N = 30; A = 3.14 × 10-2 m2 ; Angular velocity (ω) = 70 rad-1; B = 5 × 10-2 T; R = 15 Ω
Emf (E) = NABω
E = 30 × 3.14 × 10-2 × 5 × 10-2 × 70
E = 3.297 V
Current (I) = E/R
I = 3.29715
I = 0.2198 A
Average power loss (P) = I2R2
P = 0.21982 × 152
P = 0.362 W
Therefore, the average power loss due to Joule heating is 0.362 W.

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A circular coil having an area of 3.14 × 10-2 m2 and 30 turns is rotated about its vertical diameter with an angular speed of 70 rad-1 in a uniform horizontal magnetic field of magnitude 5 × 10-2 T. If the coil forms a closed loop of resistance 15 Ω, what is the average power loss due to Joule heating?