Question

An unknown resistor has 5mA current flowing through it when 10 Volts are applied to it. For the same resistor the application of 20 volts will results in the current flow of:
a) 2 mA
b) 5 mA
d) 50 mA
c) 10 mA​

Answer 1

Answer:

10mA

Explanation:

When 10V is applied on the resistor then current of 5mA flows , therefore by applying Ohm's law ,

V = I R

$10 = 5 \times {10}^{ - 3} \times r \\ r = \frac{10}{5 \times {10}^{ - 3} }ohm \\ r = 2 \times {10}^{3}ohm$

Now , when 20V is applied on it therefore current will be

$v = ir \\ 20 = i \times 2 \times {10}^{3} \\ i = \frac{20}{2 \times {10}^{3} } \\ i = 10 \times {10}^{ - 3}$

and from here we get

i = 10mA

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