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A galvonometer of resistance $ 50 \Omega$ is connected to a battery of 3V along with a resistance of $ 2950 \Omega$ in series. A full scale deflection of 30 divisions is obtained in the galvonometer. In order to reduce this deflection to 20 divisions, the resistance in series should be :

$\begin {array} {1 1} (1)\;4450 \Omega & \quad (2)\;5050 \Omega \\ (3)\;5550 \Omega & \quad (4)\;6050 \Omega \end {array}$

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