NEET2012PhysicsElectromagnetic InductionActual
A coil of resistance 400 is placed in a magnetic field. If the magnetic flux ( Wb ) linked with the coil varies with time t (sec) as =50 t^2+4 The current in the coil at t=2 ~s is
Options
- A0.5 ~A
- B0.1 ~A
- C2 ~A
- D1 ~A
Correct answer
A. 0.5 ~A
Step-by-step solution
Induced emf of coil E= |- d d t |_t Given, =50 t^2+4 and R=400 aligned E & = |- d d t |_ t=2 & =|100 t|_ t=2 =200 ~V aligned Current in the coil aligned i & = E R = 200 400 & = 1 2 =0.5 ~A aligned