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A voltmeter with an internal resistance of 5000 ohms is calibrated...

  1. A voltmeter with an internal resistance of 5000 ohms is calibrated to read 10 V at full scale. How much series resistance is needed in order to measure 150 V at full scale?
  2. A galvanometer has a coil resistance of 50 ohms and a current of sensitivity of 0.001 micro A per mm. How much is the voltage across its terminals when the deflection is 15 cm at full scale?

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