The circuit diagram includes a battery with internal resistance $r$, two resistors, a switch and a voltmeter. The switch is open. The switch is then closed. What changes occur to the current in the battery, and what happens to the voltmeter reading, when the switch is closed?
- Acurrent in battery increases; reading on voltmeter decreases
- Bcurrent in battery increases; reading on voltmeter remains the same
- Ccurrent in battery remains the same; reading on voltmeter decreases
- Dcurrent in battery remains the same; reading on voltmeter remains the same