Answer: Product A and B are complimentary Goods .
Explanation: Complimentary Goods are a part of 'Price of related goods' factor affecting demand , among the 4 factors - Price of good , Price of related goods (substitute & complimentary) , Income , Taste preferences
These are goods which are jointly demanded . Eg Inverter & Battery .
These goods price & demand have inverse relationship implying price rise of one good leads to fall in other good demand , price fall of one good leads to rise in other good demand .
This happens because price of one good rise leads to fall in its demand (price demand inverse relationship as per law of demand) , which subsequently reduces the demand for its complement good also as both are used jointly .
Similarly , price fall of good reduces its own as well as its complement good demand.
Eg Price rise of petrol can lead to a reduction in demand of cars .