Question

In a coil of resistance 10 Ω, the induced current developed by changing magnetic flux through it, is shown in figure as a function of time. The magnitude of change in flux through the coil in weber is

• A. 8
• B. 2
• C. 6
• D. 4

Answer 1

Answer: (B)

2

Answer 2

Area under i-t graph = q
q = ½ x 4 x 0.1 = 0.2 C
As $q=\frac{\Delta\phi}{R}$
Δϕ = qR
= (0.2 C)(10 Ω)
So, Δϕ = 2 weber
Hence, option B) 2 is the correct answer.