2. As frequency decreases, how does the reactance of a coil vary? 3. What is skin effect, and how does it affect the Q of a coil?

1. A coil has 500 turns and a reactance of 60 ohms but negligible resistance. If it is connected to a 120 V, 60 Hz source. Calculate the following: a. The effective value of the magnetizing current, b. The peak value of lo C. The peak mmt produced by the coil. d. the peak flux

An iron core 0.4 m long and 5 cm2is wound with 300 turns. When a current of 0.5A flows in the coil, how much is the inductance of the coil. Assume the core has a permeability of 2500.

A toroidal coil, with a circular cross-sectional area of 0.2m2. The coil inductance is 0.28H. The coil has 500 turns. How much current should flow in the coil to get a flux linkage of 498? a. 498.000 A b. 140.000 A c. 1778.571 A d. 249000.000 A e. 889285.714 A

A 500-turn coil is wound on an iron core. When a 120-V-rms 60-Hz voltage is applied to the coil, the current is 1 A rms. Neglect the resistance of the coil. Determine the reluctance of the core. Given that the cross-sectional area of the core is 5 cm2 and the length is 20 cm, determine the relative permeability of the core material.

A copper coil has a resistance of 50ohm at a temperature of 20°C and a resistance of 57.86ohm at a temperature of 60°C. So find the temperature rise when the ambient temperature is 14°C and the resistance of the coil is 60ohm.

Assume that the physical arrangement of the coils results in P1=P2. If coil 1 has 500 turns, how many turns does coil 2 have?

Explain the difference between  conductive and inductive compensation

please include working

10. A potential difference of 250 V is applied to a field winding at 15-C and the current is 5 A. What will be the temperature of the winding when current has fallen to 3.91 A applied voltage being constant. Assume temperature coefficient at 15'C is equal to 1/254.5 per °C