Question

Read the following and answer the questions from i to iv The resistivity of a conductor is given by the expression = / where R is the resistance of conductor of length l and area of cross section A. the resistivity of a conductor is independent of dimensions of conductor. It depends on the nature of material and temperature of conductor. When a number of resistors are connected in series, the effective resistance is the sum of the individual resistances. The value of the equivalent resistors is smaller than the smallest resistance in the group.
i. Which one among a bar of an alloy of mass 2 kg and a 3 kg iron bar of same dimension has greater resistivity? (a) Iron bar because it has higher mass. (b) Alloy bar because it has lower mass. (c) Iron bar because it has same types of atoms. (d) Alloy bar because it has different types of atoms.
ii. A piece of wire is measured to have resistivity in the order of 1019 Ω m. Whatshould its material be classified into? (a) Alloys (b) Insulators (c) Good conductors (d) Poor conductors
iii. Which combination of a 2 Ω resistor and 4 Ω resistor offers the least resistance to current in the circuit? (a) Series combination, which results in a net resistance of 2 Ω. (b) Parallel combination, which results in a net resistance of 2 Ω. (c) Series combination, which results in a net resistance of 1.5 Ω. (d) Parallel combination, which results in a net resistance of 0.5 Ω.
iv. The image shows a combination of 4 resistors. What is the net resistance between the two points in the circuit? (a) 0.5 Ω (b) 1.0 Ω (c) 1.5 Ω (d) 2.0 Ω​

Answer 1

Answer:

It's too conjectured

Have a great day

Answer 2

I DON'T KNOW THIS QUESTION ANSWER MY DEAR

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