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» Correct Answer - `3333 Omega`

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