An ac generator spinning at a rate of 750rev/min produces a maximum emf of 45V. At what angular speed does this generator produce a maximum emf of 102 V?
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Explanation:
ANSWER
Number of turns N=10000 turns
Area of coil A=100 cm
2
=0.01 m
2
Frequency f=140 rpm=
60
140
rps
Angular speed w=2πf=2×
7
22
×
60
140
=14.7 rad/s
Magnetic field B=3.6×10
−2
T
Maximum value of emf induced E
max
=NBAw
⟹ E
max
=10000×3.6×10
−2
×0.01×14.7=52.9 volts
#khushu☺️
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