Q209 · Practice questionComplex familiar1 mark
QUESTION 209
Two coils experience the same uniform magnetic field and the same change in orientation over the same time interval. Coil B has twice the number of turns and half the area per turn of coil A. What is the ratio of their induced average EMF magnitudes ?
(A)
(B)
(C)
(D)
WORKED SOLUTION
1 markAnswer B
ANSWER
B.
Worked solution
For the same orientation change and time, . The product is unchanged: . Therefore the average EMF magnitudes are equal.
Equivalent physically justified methods and consistent equivalent units accepted.
Displayed decimals are model answers; accept appropriate significant figures and consistent rounding from stated constants.
Select B.
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