The resistance 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 $1.6 \ell_1$ . The resistance 'R' is : <br>

Question

( A ) $15 \Omega$
( B ) $20 \Omega$
( C ) $25 \Omega$
( D ) $10 \Omega$