Home
Class 12
PHYSICS
If the angular speed of the armature of ...

If the angular speed of the armature of a dynamo is doubled then the amplitude of the induced e.m.f will become_______.

A

half

B

twice

C

as it is

D

four times

Text Solution

Verified by Experts

The correct Answer is:
B
As, `E_(0)=nBAomega" i.e., "E_(0) prop omega`
`rArr (E_(0))/(E._(0))=(omega)/(omega.) rArr (E_(0))/(E._(0))=(omega)/(2omega)=(1)/(2)`
`rArr E._(0)=2E_(0)`
Promotional Banner

Similar Questions

Explore conceptually related problems

The cause of induced e.m.f is

If rotational velocity of a dynamo armature is doubled, then induced e.m.f. will become

The induced e.m.f in a circuit

What is the basic cause of induced e.m.f. ?

In a dc motor, induced e.m.f. will be maximum

The direction of the induced e.m.f. is determined by

For a coil of unit area, induction is doubled in 0.2s . Then, the induced e.m.f. is