An electric current (I) flowing through a metallic wire is gradually increased. The graph of…
An electric current ($I$) flowing through a metallic wire is gradually increased. The graph of heating power ($P$) developed in it versus the current ($I$) is:
(a)(a)
(b)(b)
(c)(c)
(d)(d)
Answer
Answer
Correct option: (c)
Answer: (c) the graph in (c), a curve rising from the origin with increasing slope
$P = I^2R$, so $P \propto I^2$: the graph is a parabola through the origin.
