COMEDK2014PhysicsElectromagnetic Induction
The normal magnetic flux passing through a coil changes with time according to the equation =6 t²-5 t+1 . What is the magnitude of the induced current at t=0.253 ~s and resistance 10 ?
Options
- A1.2 ~A
- B0.8 ~A
- C0.6 ~A
- D0.2 ~A
Correct answer
D. 0.2 ~A
Step-by-step solution
Given, magnetic flux =6 t²-5 t+1, R=10 Induced emf, e=- d d t =- d d t (6 t²-5 t+1 )e=-12 t+5 At t=0.253 ~s , e=-12 0.253+5=-3.036+5=1.964 ~V Induced current, I= e R = 1.964 10 =0.1964 ~A 0.2 ~A