Which of the following is not the use of a shunt?

The correct answer is Option (2) → To increase the range of voltmeter

A shunt is a low resistance connected in parallel with a galvanometer or ammeter, so that most of the current bypasses the coil.

Option (1) To prevent a galvanometer from being damaged due to a large current — A use. The shunt carries the excess current, so the coil is protected from a large current.

Option (2) To increase the range of voltmeter — Not a use. A voltmeter is made or extended by connecting a high resistance in series with the galvanometer. A parallel shunt would only lower its resistance.

Option (3) To convert a galvanomter into an ammeter — A use. A galvanometer with a suitable shunt in parallel works as an ammeter.

Option (4) To increase the range of an ammeter — A use. A smaller shunt resistance lets a larger current pass through the meter without damage, so the range of an ammeter increases.

NCERT (2026-27):
The Moving Coil Galvanometer – “… To overcome these difficulties, one attaches a small resistance r_s, called shunt resistance, in parallel with the galvanometer coil; so that most of the current passes through the shunt.”

The Moving Coil Galvanometer – “… The galvanometer can also be used as a voltmeter to measure the voltage across a given section of the circuit. … To ensure this, a large resistance R is connected in series with the galvanometer.”