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QJEEM22Ph37c0: JEE Main 2022 Physics - Class 12 JEEM22Ph37c0 Solution: Two cells of same emf but different internal resistances r 1…

Two cells of same emf but different internal resistances r1 and r2 are connected in series with a resistance R. The value of resistance R, for which the potential difference across second cell is zero, is :

Multiple Choice Options

  • A r2 −- r1
  • B r1 −- r2
  • C r1
  • D r2

Step-by-Step Verified Solution

JEE Main 2022 (Online) 25th June Evening Shift Physics - Current Electricity Question 142 English Explanation

I=2εR+r1+r2I = {{2\varepsilon } \over {R + {r_1} + {r_2}}}

As per the question,

2εR+r1+r2×r2−ε=0{{2\varepsilon } \over {R + {r_1} + {r_2}}} \times {r_2} - \varepsilon = 0

⇒R=r2−r1\Rightarrow R = {r_2} - {r_1}

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