are the batteries used in tractors, trucks and inverters are also made from cells ?? then why it is called a battery ?

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Solution

It is because of the fact since battery is nothing but is a combination of two or more electric cells.

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Question 14

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Q. Twelve cells, each having an e.m.f of E volt are connected in series and are kept in a closed box. Some of these cells are wrongly connected with positive and negative terminals reversed. This 12 cell battery is connected in series with an ammeter, an external resistance R ohms and a two-cell battery (two cells of the same type used earlier, connected perfectly in series). The current in the circuit when the 12-cell battery and 2-cell battery aid each other is 3A and is 2A when they oppose each other.

Then the number of cells in 12-cells battery that are connected wrongly is:

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