The question analysed in this Exam talkback is on electrical concepts such as resistivity, number density of free electrons and power dissipation.
Rather than setting a question on a rectangular conducting block, the examiners have devised a question that looks at a conductor microscopically in terms of the arrangement of atoms. You could easily be overwhelmed by the question, but by carefully scrutinising it and underlining or highlighting key information and data, you can use your basic knowledge of physics to tackle the question successfully.
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