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Shown in the figure below is a meter-bridge set up with null deflection in the galvanometer<br> <img src="http://clay6.com/mpaimg/4_Screenshot_1.jpg"/><br> The value of the unknown resistor R is


( A ) $13.75\Omega$
( B ) $220\Omega$
( C ) $55\Omega$
( D ) $110\Omega$

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