Define the term mutual inductance and hence obtain an expression for two long coaxial solenoids. Also state the reciprocity theorem.
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https://www.meritnation.com/ask-answer/question/what-is-mutual-inductance-show-that-coefficients-of-mutual/electromagnetic-induction/8114579
https://www.meritnation.com/ask-answer/question/deduce-the-expression-for-the-mutual-inductance-of-two-long/physics/5939145
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https://www.meritnation.com/ask-answer/question/what-is-mutual-inductance-show-that-coefficients-of-mutual/electromagnetic-induction/8114579
https://www.meritnation.com/ask-answer/question/deduce-the-expression-for-the-mutual-inductance-of-two-long/physics/5939145
Kindly post your questions separately so that we can help you out.