Match the different shapes of the cells:

Matching cell shapes
Tracheid cells are elongated (I - D).
Nerve cells are branched and long (II - C).
White blood cells have an amoeboid shape (III - B).
Red blood cells are round and biconcave (IV - A).
Final Answer: \[ I - D, II - C, III - B, IV - A \]
In the given circuit, if the potential at point B is 24 V, the potential at point A is:
