問題詳情
81. In the diagram below the voltmeter V has a resistance of 100 kΩ and is connected suchas to measure the potential difference across the 100 kΩ resistor. The battery has an emfof 5.0 V and negligible internal resistance.The reading on the voltmeter will be__________ .
(A) 4.0V.
(B) 2.5V.
(C) 1.0V.
(D) 0V.