when switch s in the figure is open, the voltmeter v of the battery reads 3.12 v. when the switch is closed…

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 2.99 v, and the ammeter a\n\npart a\n\nfind the emf e.\n\nexpress your answer in volts to three significant digits.\n\npart b complete previous part(s)\n\npart c complete previous part(s)

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 2.99 v, and the ammeter a\n\npart a\n\nfind the emf e.\n\nexpress your answer in volts to three significant digits.\n\npart b complete previous part(s)\n\npart c complete previous part(s)

Answer

Explanation:

Step1: Recall emf concept

When the switch is open, no current flows through the circuit. In this case, the volt - meter reading is equal to the electromotive force (emf) of the battery.

Step2: Identify emf value

Since the volt - meter reads 3.12 V when the switch is open, the emf $\mathcal{E}$ of the battery is equal to this open - circuit voltage. So, $\mathcal{E}=3.12$ V.

Answer:

3.12 V