Say you have a potential divider circuit. There are 2 resistors both of 20 x 10^3 ohms in series. Across one of the resistors a voltmeter is connected also with resistance 20 x 10^3 ohms. If the voltmeter is removed and replaced with another voltmeter of resistance 10 x 10^6 ohms, why does the output voltage remain the same?
The mark scheme says exactly "High resistance >> R1" and "No change in circuit/no current flows through 10 MΩ" for 2 marks. Is this first point trying to say the resistance of the voltmeter is greater than that of R1, if so then I don't understand how this means the output voltage is the same.
My guess would have been that both the resistors remain the same, but then wouldn't the voltage split in a different ratio since the the voltmeter has changed?