An Old 90-V Battery Produces a Potential Difference of 9

Multiple Choice

An old 9.0-V battery produces a potential difference of 9.0 V when checked with a voltmeter.A student is still suspicious of the battery and measures a voltage of 7.6 V when a 100-Ω resistor connects the battery leads.What is the internal resistance of this battery?

A) 14.3 Ω
B) 15.6 Ω
C) 18.4 Ω
D) 20.4 Ω
E) 21.65 Ω