In which of the follwing arrangements of resistors does the meter `M`, which has a resistance of `2 Omega`, give the largest reading when the same potential difference is appliced between points `P` and `Q`?

Options

A.
B.
C.
D.

Answer

C

Explanation

If `V` is the potential difference applied across `P` and `Q`, the current through `M` is determined as follows:
`{:("Circuit","Current),((a),V//4),((b),3V//8),((c),V//2),((d),V//3):}
Hence, circuit arrangement (c ) gives the largest reading in ammeter `M`.