A constant 60 V d.c. supply is connected across two resistors of resistance 400 and 200
. What is the reading of the voltmeter, also of resistance 200
, when connected across the second resistor as shown in Figure?
12V
15V
20V
30V
Effective resistance across the voltmeter =
Total resistance across d.c. supply =
Thus, the voltage across the voltmeter =