The Ammeter Your Physics Instructor Uses for In-Class Demonstrations Has $\varOmega$

question 38

Multiple Choice

The ammeter your physics instructor uses for in-class demonstrations has a resistance R_g and requires a current of 1.0 mA for full-scale deflection.The same ammeter can be used to measure currents of much greater values by wiring a shunt resistor of relatively small resistance,R_p ,in parallel with the ammeter.The shunt resistance needed to produce a full-scale current of 12 A is 3.5 m $\varOmega$ .What is the resistance of the ammeter,R_g?

• A)75 \(\varOmega\).
• B)35 \(\varOmega\).
• C)42 \(\varOmega\).
• D)28 \(\varOmega\).
• E)60 \(\varOmega\).

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