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Physics

Current drawn from the cell :

  1. I = ε[R+r]
  2. I = ε(R+r)\dfrac{{\varepsilon}}{{(R + r)}}
  3. I = εR
  4. I = E(r)\dfrac{{E}}{{(r)}}

Current Electricity

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Answer

I = ε(R+r)\dfrac{{\varepsilon}}{{(R + r)}}

Reason — The current drawn from the cell

I =  e.m.f. of cell total resistance\dfrac{\text { e.m.f. of cell}}{\text { total resistance}} = ε(R+r)\dfrac{{\varepsilon}}{{(R + r)}}

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