Which of the following is NOT true about a shunt?

The correct answer is Option (3) → A shunt is used for converting a galvanometer into a voltmeter

A shunt is a low resistance connected in parallel with a galvanometer. It carries most of the current, so only a small part passes through the galvanometer coil.

Option (1) A shunt may be used for increasing the range of an ammeter — True about a shunt (Incorrect). A smaller shunt sends a larger share of the current past the coil, so the range rises.

Option (2) A shunt is used to protect the galvanometer from the strong currents — True about a shunt (Incorrect). The shunt bypasses most of a strong current.

Option (3) A shunt is used for converting a galvanometer into a voltmeter — Not true about a shunt (Correct). A galvanometer becomes a voltmeter with a high resistance in series, not a low resistance in parallel.

Option (4) A shunt is used for converting a galvanometer into an ammeter — True about a shunt (Incorrect). A low resistance in parallel turns it into an ammeter.

NCERT (2026-27):
Summary – “… 11. A moving coil galvanometer can be converted into a ammeter by introducing a shunt resistance r_s, of small value in parallel. It can be converted into a voltmeter by introducing a resistance of a large value in series.”