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The flux lines of two energised coils overlapping on each other will give

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The flux lines of two energised coils overlapping on each other will give

(a) Series aiding

(b) Shunt aiding

(c) Series opposing

(d) Shunt opposing

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The above asked question is from Magnetic Energy and Circuits topic in division Magnetic Forces and Materials of Electromagnetic Theory

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The correct choice is (a) Series aiding

To elaborate: Flux lines are the magnetic lines of force of a magnetic material. Since the flux is overlapping, the total flux of the two coils together will be high. Thus it is an aiding flux. Also this type of overlapping is possible only when the two coils are back to back or in series connection.

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