Q44 / 68 · NTA Abhyas (JEE Main) 2020 · Physics · Electromagnetic Induction

The magnetic flux through a circuit of resistance R changes by an amount Δ ϕ in a time Δ t . Then the total quantity of electric charge Q , that passes through any point in the circuit during this Δ t time is, represented by

  • A
    Q = 1 R Δ ϕ Δ t
  • Correct answer
    B
    Q = Δ ϕ R
  • C
    Q = Δ ϕ Δ t
  • D
    Q = R Δ ϕ Δ t

Solution

Induced emf is given by ε = Δ ϕ Δ t

Current, I = Q Δ t = Δ ϕ Δ t × 1 R   [where Q is total charge passed in time Δ t ]

⇒      Q = Δ ϕ R

Hence, the correct answer is option: 'B'.

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