JEE Main2017PhysicsElectromagnetic InductionActual
In a coil of resistance 100 Ω , a current is induced by changing the magnetic flux through it as shown in the figure. The magnitude of change in flux through the coil is:
Options
- A275   Wb
- B200   Wb
- C225   Wb
- D250   Wb
Correct answer
D. 250   Wb
Step-by-step solution
E m f = i R ⇒ - d ϕ d t = i R ∫ - d ϕ = ∫ ( i d t ) R q = Δ ϕ R =  Area under   i - t   graph ⇒ ∆ ϕ = 1 2 × 10 × 0 . 5 × 100 = 250   Wb