Two resistors R1=5kΩ and R2=5kΩ are connected in series across a 10V battery of negligible internal resistance. A voltmeter of internal resistance Rv=5kΩ is used to measure the potential difference across R2. What reading will the voltmeter show?
a) 6.7V
b) 2.5V
c) 3.3V
d) 5.0V