KCET2018PhysicsElectromagnetic Induction
The magnetic flux linked with a coil varies as ( =3 t²+4 t+9 . ) The magnitude of the emf induced at ( t=2 ) seconds is
Options
- A( 8 ~V )
- B( 16 ~V )
- C( 32 ~V )
- D( 64 ~V )
Correct answer
B. ( 16 ~V )
Step-by-step solution
Given, magnetic flux, ( =3 t²+4 t+9 ; t=2 s ) Since, emf induced ( = d d t ) Therefore, emf induced at ( t=2= . d d t |_ t=2 ) Now, ( d d t =6 t+4 ) ( . d d t |_ t=2 =6 2+4=12+4=16 ) Thus, emf induced ( =16 ~V )