A PMMC Ammeter has a coil of effective depth of 5 cm and a width of 20 mm, the coil has about 150 turns, and it has coil resistance of 20 ohms. The flux spread in the air gap is done at density of 100mWb / m Then calculate, 1. Control torque produced by the coil, when it measures 15 A. ii. Spring constant, when it measures 15 A and deflects by an angle of 30 ° Deflection torque exerted on the pointer, when it measures 20 A.

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Q23. A PMMC Ammeter has a coil of effective depth of 5 cm and a width of 20 mm, the coil has about 150 turns, and it has coil resistance of 20 ohms. The flux spread in the air gap is done at density of 100mWb / m Then calculate, 1. Control torque produced by the coil, when it measures 15 A. ii. Spring constant, when it measures 15 A and deflects by an angle of 30 ° Deflection torque exerted on the pointer, when it measures 20 A. Analyze the relationship between the area of ​​moving coil and deflection torque produced in a PMMC instrument iv.
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