Questions
Two batteries each of emf E and internal resistance r are connected turn by furn in series and in parallel, and are used to find current in an external resistance R. If the current in series is equal to that in parallel, the internal resistance of each battery is:
detailed solution
Correct option is A
Is =2E2r+R and IP =Er2+R = 2Er+2RIf IS =IP2E2r+R = 2Er+2R2r+R=r+2Rr=RTalk to our academic expert!
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An electric current is passed through a circuit containing two wires of the same material, connected in parallel. If the lengths and radii of the wires are in the ratio of (4/3) and (2/3), then the ratio of the currents passing through the wires will be
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