The resistances in the two arms of the meter bridge are $5 \,\Omega$ and $R \,\Omega$ respectively. When the resistance $R$ is shunted with an equal resistance, the new balance point is at $1.6\,l_1$. The resistance $R$ is ..................  $\Omega$
  • A$10$
  • B$15$
  • C$20$
  • D$25$
AIPMT 2014, Diffcult
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