The correct answer is: A. moving iron instrument
An ohmmeter is a measuring instrument used to measure electrical resistance. It is a type of moving iron instrument, which means that it uses a moving iron core to measure the current flowing through a circuit. The core is attached to a pointer that moves across a scale, which indicates the amount of resistance.
A moving coil instrument is a type of electrical measuring instrument that uses a coil of wire to measure current. The coil is placed in a magnetic field, and the current flowing through the coil creates a force that moves the coil. The movement of the coil is then used to measure the current.
A dynamometer instrument is a type of electrical measuring instrument that uses a dynamometer to measure current. A dynamometer is a device that measures the force between two rotating shafts. The current flowing through a circuit creates a force that rotates the shafts of the dynamometer. The rotation of the shafts is then used to measure the current.
None of the above is not the correct answer because an ohmmeter is a type of moving iron instrument.