An ohm-meter is a device that measures an unknown resistance. A simple ohm-meter can be constructed using a galvanometer as shown in the figure. The cell used in the circuit has emf E = 20 volt. The full scale deflection current and resistance of the galvanometer are 2 mA and 20 Omega respectively. R_(0) is a fixed resistance and R is the unknown resistance whose value is directly given by the galvanometer scale. The galvanometer scale is shown in figure. When an unknown resistance R is placed in the circuit, the pointer deflects by theta = 90^(@). Find R.

An ohm-meter is a device that measures an unknown resistance. A simple

1.	An ohm-meter is a device that measures an unknown resistance. A simple ohm-meter can be constructed using a galvanometer as shown in the figure. The cell used in the circuit has emf E = 20 volt. The full scale deflection current and resistance of the galvanometer are 2 mA and 20 Omega respectively. R_(0) is a fixed resistance and R is the unknown resistance whose value is directly given by the galvanometer scale. The galvanometer scale is shown in figure. When an unknown resistance R is placed in the circuit, the pointer deflects by theta = 90^(@). Find R.
Answer» ANSWER :`3333 OMEGA`

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