When switch S in the figure is open, the voltmeter V of the battery reads 3.12 V

Question

When switch S in the figure is open, the voltmeter V of the battery reads 3.12 V . When the switch is closed, the voltmeter reading drops to 2.98 V , and the ammeter A reads 1.68 A . Assume that the two meters are ideal, so they do not affect the circuit. (Figure 1)

Part A

Find the emf E.

Express your answer in volts to three significant digits.

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When switch S in the figure is open, the voltmeter V of the battery reads 3.12 V . When the switch is closed, the voltmeter reading drops to 2.98 V , and the ammeter A reads 1.68 A . Assume that the two meters are ideal, so they do not affect the circuit. (Figure 1)

Part A

Find the emf E.

Express your answer in volts to three significant digits.

SubmitRequest Answer

Explanation / Answer

Since switch is open no current flow through 'r' hebce there is not any potential drop across ''r'

Hence voltmeter reads EMF of battery which is EMF=3.2V

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