Concepts Of Physics MCQ Edition [Volume 2]PhysicsElectric Current in Conductors
A voltmeter is constructed from a 25 coil connected in series with a 575 resistor. If the coil requires 10 mA for full scale deflection, determine the maximum potential difference that this voltmeter can measure.
Options
- A60 V
- B0.25 V
- C6 V
- D5.75 V
Correct answer
C. 6 V
Step-by-step solution
The total resistance of the voltmeter is the sum of the resistance of the coil and the series resistor. R = R_c + R_s Substituting the given values: R = 25 + 575 = 600 The maximum potential difference V that the voltmeter can measure corresponds to the full scale deflection current I_g . V = I_g R Given I_g = 10 mA = 10 10⁻³ A , we get: V = (10 10⁻³ A ) (600 ) V = 6 V