Physics-(general)
NEET Physics (general) MCQ Question
Type: MCQ-diagram based-Hard-Class 12
Consider a diagram showing a rectangular slab of length and area of cross-section . If the resistance of the slab is given by the expression , where is the resistivity of the material, what does this relationship imply about the resistance when the length of the slab is doubled and the area of cross-section is halved?
A
Resistance increases by a factor of 4.
B
Resistance remains unchanged.
C
Resistance doubles.
D
Resistance decreases by a factor of 2.
Correct Answer
Option A
Detailed Explanation
According to the formula , doubling the length and halving the area results in the resistance being multiplied by 4, since is directly proportional to and inversely proportional to .
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