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Answer:
Vt = 1250V ; R1 = 250Ω
Explanation:
Vt & R1 fixed
resultant Resistance R' = R1 + R2
when R2 = 1kΩ & I = 1mA
R' = R1 + 1000 & I = 1/1000
but. ..
Vt / R' = I (ohm's law)
hence. ..
Vt / ( R1+1000) = 1/1000
Vt = (R1+1000)/1000........(1)
again when....
R2 = 0Ω & I = 5mA
R' = R1 + 0 = R1 & I = 5/1000
hence....
Vt / ( R1) = 5/1000
Vt = 5R1/1000..............(2)
from (1) & (2)
R1 = 250Ω & Vt = 1250V
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