Correct answer
The positive terminal of one battery with the negative terminal of the other.
If you need to connect two batteries to obtain a higher voltage, they must be connected in series. This means connecting the positive terminal of one battery to the negative terminal of the other. This allows the voltages of the two batteries to be added together.
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The positive terminal of one battery to earth and the negative terminal of the other connected to the power supply.
The positive terminal of one battery with the negative terminal of the other.
The negative terminal of one battery with the negative terminal of the other.
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