2016:
The answer is (A) 0.
The magnetic flux is given by Φ = BA cos θ. When the coil is rotated by 180° about its diameter, θ becomes 180°. Therefore, Φ = BA cos 180° = 0.
2017:
The answer is (A) be doubled.
The magnetic flux is given by Φ = BA. When the radius of the loop is doubled, the area of the loop becomes 4 times. Therefore, the magnetic flux becomes 4 times.
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