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As copper shading bands move up ________

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As copper shading bands move up ________

(a) more flux is induced

(b) less flux is induced

(c) intermediate flux is induced

(d) no flux is induced

I have been asked this question in homework.

Question is taken from Lag Adjustment Devices topic in portion Measurement of Power and Related Parameters of Electrical Measurements

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The correct option is (a) more flux is induced

To explain: When the copper shading bands are moved up the central limb, more flux is induced. As a result the difference in angle between the phase and voltage increases. The angle can be made approximately equal to 90 degrees.

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