Two metallic wires P and Q are tested separately at the same temperature

PHYSICS · Single correct · A Level · Physics · Electricity · Electricity

Problem

Two metallic wires P and Q are tested separately at the same temperature. Their

I

–

V

graphs are straight lines passing through the origin. For an applied voltage of

2.0\,\text{V}

, wire P carries a current of

0.40\,\text{A}

while wire Q carries

0.60\,\text{A}

. Which statement about their resistances is correct? (a)

R_{\text P} < R_{\text Q}

(b)

R_{\text P} = R_{\text Q}

(c)

R_{\text P} > R_{\text Q}

(d) The information is insufficient to compare

R_{\text P}

and

R_{\text Q}