Failed to connect to MySQL: Access denied for user 'examnext_online'@'localhost' (using password: YES) 32 cells, each of emf 3V, are connected in series and kept in a box. Externally the combination shows an emf of 84 V. The number of cells reversed in the combination is - Sarthaks eConnect
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Practice Online Test Series for JEE Main 2018 & NEET 2018

32 cells, each of emf 3V, are connected in series and kept in a box. Externally the combination shows an emf of 84 V. The number of cells reversed in the combination is:

A.

zero

B.

2

C.

4

D.

8