a 3.5 V battery in series with a resistance R and an ammeter that reads from 0 t

Question

a 3.5 V battery in series with a resistance R and an ammeter that reads from 0 to 1.00 MA, as shown in the figure below. Resi R is adjusted so that when the clip leads are shorted together, the meter deflects to its full-scale value of 1.00 mA (a) what external resistance across the leads results in a deflection of 10% of full scale? 5e3 results in a deflection of 50% of full scale? (c) what resistance results in a deflection of 90% of full scale? d "the ammeter has a resistance of 33.0 and the internal resistance of the battery is negligible. what is the value of A?

Explanation / Answer

(b)

50%(1 mA) = 3.5 V / (R + r)

r = 3.5V / (0.5 mA) - 3.5 kohm = 3.5 kohm

(c)

90%(1 mA) = 3.5 V / (R + r)

r = 3.5V / (0.9 mA) - 3.5 kohm = 0.38889 kohm

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