ofi A certain wire has resistance R. Another wire, of the same material, has hal

Question

ofi A certain wire has resistance R. Another wire, of the same material, has half the Length and half the diameter of the first wire. The resistance of the second wire isi a) R/4 b) R /2 c) R d) 4R Q6. A certain electric furnace consumes 24 kw when it is connected to a 240-V line. What is the resistance of the furnace? a) 0.42 2 b) 10 Q 2.40 d) 109 S2 e) 12 Q7. The circuit shown below has two resistors and one battery. If resistor R1 is taken away, the current at resistor R2 a) Remains the same b) Increases c) Decreases d) None of above Q8. The magnitude of the internal resistance (r) shown in the below circuits is: (l) a) 1.5 2 b) 22 c) 10 2 d) 3.5 2 30 2 A e) 52 Term Test Physics 2 Applied Physics Department

Explanation / Answer

From the first connection Vb-Va = 2*3=6v

Current through third connection I= 2A+1A=3A

From the third connnection Vb-Va = -(3)*r+12=12-3r V

Therefore 12-3r=6

i.e., 3r=6 ie., r=2 Ohms

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