The lengths and cross-sectional areas of four copper wires P- Q- R and S are respectively 1 - 2-2 A -2 l - A - 2-2 l - 2 A and l - 2- A - 2- The wire which has the maximum resistance isA- PB- Q C- RD- S

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Standard X

Physics

Factors Affecting Resistance & How They Affect

The lengths a...

Question

The lengths and cross-sectional areas of four copper wires P, Q, R and S are respectively (l/2,2A),(2l,A/2),(2l,2A) and (l/2, A/2). The wire which has the maximum resistance is

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Solution

The correct option is B
Q

Resistance increases linearly with length and decreases with increasing area of cross section.

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Wire $1$ : Length $l$ , Cross section area $A$
Wire $2$ : Length $l$ , Cross section area $2 A$
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The lengths and cross-sectional areas of four copper wires P, Q, R and S are respectively (l/2,2A),(2l,A/2),(2l,2A) and (l/2, A/2). The wire which has the maximum resistance is

The correct option is B Q Resistance increases linearly with length and decreases with increasing area of cross section.

The correct option is B
Q

Resistance increases linearly with length and decreases with increasing area of cross section.