In Figure a voltmeter of resistance R _v = 300? and an ammeter of resistance R_A = 3.00? are being used to measure a resistance R in a circuit that also contains a resistance R₀ = 100? and an ideal battery of emf ? = 12.0 V. Resistance R is given by R = V/i, where V is the voltmeter reading and i is the current in resistance R. However the ammeter reading is not i but rather i', which is i plus the current through the voltmeter. Thus, the ratio of the two meter readings is not R but only an apparent resistance R' = V/i'. If R = 85.0?, what are

(a) The ammeter reading,

(b) The voltmeter reading, and

(c) R'?

(d) If R _v is increased, does the difference between R' and R increase, decrease, or remain the same?

Transcribed Image Text:

v) 8.