You have a microammeter which reads 50 microamps at fullscale deflection, and the coil in the meter movement has a resistance of 20 ohms. By adding two resistors, R{ and R2, and a 1.5-volt battery you can convert this into an ohmmeter. When the two outcoming leads of this ohmmeter are connected together, the meter is to register 0 ohms by giving exactly full-scale deflection. When the leads are connected across an unknown resistance R, the deflection will indicate the resistance value if the scale is appropriately marked. In particular, we want half-scale deflection to indicate 15 ohms. What values of Rx and R2 are required, how should the connections be made, and where on the ohm scale will the marks be (with reference to the old microammeter calibration) for 5 ohms and for 50 ohms?