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Q4. A non-linear resistor whose characteristic is given by I = KV^1/2 is connected in series with a variable resistance across a 120 V d.c. supply. When the variable resistance is set to 56  the current in the circuit is 1A. Calculate EACH of the following:

(a) the value of the constant K;

(b) the value to which the variable resistance must be set to make the current 0.75 A;

(c) the power dissipated in the non-linear resistor when the current is 0.75 A.