Answer: Connecting a high resistance in series with the galvanometer coil.
- A Connecting a low resistance in parallel with the galvanometer coil
- B Increasing the number of turns in the galvanometer coil
- C Connecting a high resistance in series with the galvanometer coil
- D Removing the restoring spring from the galvanometer
Correct answer: C. Connecting a high resistance in series with the galvanometer coil
Explanation: A galvanometer is converted into a voltmeter by connecting a high resistance in series, which limits the current through the coil and extends the voltage range it can measure.
The magnetic field around a long straight current-carrying wire forms concentric circles, with direction given by the right-hand rule (point thumb along I, fingers curl in the direction of B).
Concept context
Magnetic force on moving charges and currents, the Biot-Savart law, Ampere's law, and the cyclotron - how electric currents create and respond to magnetic fields.