11. For circuit shown in figure, the current must not exceed(1) 1 mA(2) 2 mA(4) 10 mA(3) 5 mA
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The minimum current out of these three is 1 mA, hence the current must not exceed 1 mA current.
Explanation:
P = I^2R
Maximum current through 250 K ohm resistor = √ P / R = √ 1 / 4 x 250 x 10^3
= 1 / 2 x 5 x 100 = 1 mA
Through middle 10 K ohm resistor = √ P / R = √ 1 / 4 x 10 x 10^3
= 1 / 2 x 100 = 5 mA
Through last 10 K ohm resistor = √ P / R = √ 1 / 10 x 10^3 = 1/100 = 10 mA
]So the minimum current out of these three is 1 mA, hence the current must not exceed 1 mA current.
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