# Question

(a) Explain why the maximum emf produced by an ac generator occurs when the flux through its armature coil is zero.

(b) Explain why the emf produced by an ac gennrator is zero when the flux through its armature coil is at its maximum.

(b) Explain why the emf produced by an ac gennrator is zero when the flux through its armature coil is at its maximum.

## Answer to relevant Questions

What should be the diameter of a circular wire loop if it is to have a magnetic field of 0.15 T oriented perpendicular to its area which produces a magnetic flux of 1.2 x 10-2 T ∙ m2? The flux through a loop of wire changes uniformly from + 40Wb to – 20Wb in 1.5ms. (a) What is the significance of the negative number attached to the final flux value? (b) What is the average induced emf in the loop? ...The armature of a simple ac generator has 20 circular loops of wire, each with a radius of 10 cm. It is rotated with a frequency of 60 Hz in a uniform magnetic field of 800 mT. (a) What is the maximum emf induced in the ...The primary coil of an ideal transformer has 720 turns, and the secondary coil has 180 turns. If the primary coil carries 15 A at a voltage of 120 V, what are (a) The voltage and (b) The output current of the secondary ...A small plant produces electric energy and, through a transformer, sends it out over the transmission lines at 50 A and 20 kV. The line reaches a small town over 25-km-long transmission lines whose resistance is 1.2 Ω /km. ...Post your question

0