alleryIf two identical slabs are joined end to end, the combined resistance is:
AHalf of R
BSame as R
CFour of R
DTwice R
Answer & Solution
Correct answer: D. Twice R
1. Joining end to end doubles the length of the path.
2. Doubling the length doubles the resistance.
3. So the combination has twice the resistance.
4. The answer is twice R.
_Source: syllabus Physics, Ch 3 'Current Electricity'_
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