Electric Circuits
Two battery having unequal emf

 cannot be connected in series.
 cannot be connected in parallel.
 can be connected in series only.
 both a and d

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Electric Circuits
What is time period T?

 Time taken by an alternating quantity to complete the (+)ve half.
 Time taken by an alternating quantity to complete one full cycle.
 Time taken by an alternating quantity to complete the (-)ve half.
 Time taken by an alternating quantity to reach the peak value.

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