Explanation:

The correct answer is option D, which states that the resistance is less in a moving iron type ammeter with few turns of thick wire. Let's understand why this is the case.

Introduction to Moving Iron Type Ammeter:
A moving iron type ammeter is an instrument used to measure electric current in a circuit. It works on the principle of the magnetic effect of electric current. The basic working of a moving iron type ammeter involves the interaction between the magnetic field produced by the current-carrying conductor and the magnetic field produced by the iron core. As the current passes through the conductor, it creates a magnetic field around it, which interacts with the magnetic field produced by the iron core. This interaction causes the iron core to move, and the movement is indicated by a pointer on a calibrated scale.

Factors Affecting the Performance of Moving Iron Type Ammeter:
Several factors affect the performance of a moving iron type ammeter, including sensitivity, damping, scale, and resistance. Let's discuss each of these factors in detail:

1. Sensitivity:
Sensitivity refers to the ability of an ammeter to accurately measure small changes in current. In a moving iron type ammeter, having few turns of thick wire increases the sensitivity. This is because the magnetic field produced by the current-carrying conductor is directly proportional to the number of turns of the wire. By using a few turns of thick wire, the magnetic field produced is stronger, leading to higher sensitivity.

2. Damping:
Damping refers to the ability of an ammeter to quickly settle down and provide a stable reading. In a moving iron type ammeter, damping is achieved by using a damping mechanism, such as a vane or a fluid-filled chamber. The damping mechanism reduces the oscillations of the iron core, allowing it to settle down quickly. The number of turns of wire does not directly affect the damping of the ammeter.

3. Scale:
The scale of an ammeter refers to the range of current values that can be measured by the instrument. In a moving iron type ammeter, the scale can be adjusted by selecting appropriate values for the resistance and the number of turns of wire. The number of turns of wire does not directly affect the scale of the ammeter.

4. Resistance:
Resistance refers to the opposition offered by a material to the flow of electric current. In a moving iron type ammeter, having few turns of thick wire reduces the resistance. This is because the resistance of a wire is inversely proportional to its cross-sectional area. By using thick wire, the cross-sectional area is increased, leading to lower resistance. Lower resistance allows more current to flow through the ammeter, making it more accurate in measuring the actual current in the circuit.

Conclusion:
In conclusion, the correct answer is option D, which states that the resistance is less in a moving iron type ammeter with few turns of thick wire. This is because using a few turns of thick wire reduces the resistance, allowing more current to flow through the ammeter and making it more accurate in measuring the actual current in the circuit.