Magnetic flux through a coil of resistance $10Ω$ is changed by $Δ ϕ$ in $0.1 s$ . The resulting current in the coil varies with time as shown in the figure. Then $∣Δ ϕ ∣$ is equal to (in weber)

Question

Magnetic flux through a coil of resistance 10Ω is changed by Δ ϕ in 0.1 s . The resulting current in the coil varies with time as shown in the figure. Then ∣Δ ϕ ∣ is equal to (in weber)

TestHub · Accepted Answer

As e = Δ t Δ ϕ ​ ⇒ Δ ϕ = ​ or R i = Δ t Δ ϕ ​ ( ∵ e = R i ) = R ( i .Δ t ) = R × area under i − t graph 10 × 2 1 ​ × 4 × 0.1 = 2 weber ​

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