In the circuit shown in Fig. the batteries have negligible internal resistance and the meters are both idealized. With the switch S open, the voltmeter reads 15.0 V.
(a) Find the emf E of the battery.
(b) What will the ammeter read when the switch is closed?

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30.00 20.0 25.0 V 75.0 50.0 Ω E=? Ω +1