kindly explain these points,
the voltage in ac generator can be increased by:
(a) winding the coil round a soft iron core to increase the strength of magnetic field.
(b) using a coil with more turns.
(c) rotating the coil faster.
(d) using a coil with larger area.

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Solution

$A c g e n e r a t o r w o r k s o n t h e p r i c i c p l e o f t h e e l e c t r o m a g n e t i c i n d u c t i o n . h e n c e v o l t a g e i s g i v e n b y : V = N B A ω \cos ω t w h e r e N i s t h e n o . o f t u r n s, A i s t h e a r e a o f t h e c o i l, B i s t h e s t r e n n g t h o f m a g n e t i c f i e l d, ω i s t h e a n g u l a r f r e q u e n c y o f t h e r o t a t i n g c o i l . h e n c e, (a) a n d (b) A s w i n d i n g i n c r e a s e s, V o l a t g e i n c r e a s e s . (c) a s ω i n c r e a s e s (c o i l r o t a t e s f a t s e r), v o l t a g e i n c r e a s e s . (d) A s a r a e A i n c r e a s e s, v o l t a g e i n c r e a s e s .$

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Similar questions

Each one of the following changes will increase emf (or voltage) in a simple generator except :

(a) increasing the number of turns in the armature coil

(b) winding the coil on a soft iron armature

(d) increasing the speed of rotation

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