In the image given below, two cells of 10 V each are connected to coil I to form a battery of 20 V. What will happen if one of those cells is replaced with a 5 V cell?

Galvanometer deflection will become zero.

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Galvanometer will deflect in the opposite direction with the same deflection.

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Galvanometer will deflect in the same direction with lesser deflection.

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Galvanometer will deflect in the opposite direction with lesser deflection.

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Solution

The correct option is C Galvanometer will deflect in the same direction with lesser deflection.

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^{'} n^{'}

cells, each of emf

^{'} e^{'}

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^{'} r^{'}

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^{'} m^{'}

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^{'} R^{'}

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^{'} I^{'}

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^{'} R^{'}

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12 cells each having same e.m.f are connected in series and are kept in a closed box. Some of the cells are wrongly connected. This battery is connected in series with an ammeter and two cells identical with the others. The current is 3A when the cells and the battery support each other and 2A when the cells and the battery oppose each other. The number of cells in the battery that are wrongly connected is

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.

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