Question

A current of 2 A passing through conductor
produces 80 J of heat in 10 seconds. The resistance
of the conductor is
(a) 0.5
(b) 2
(c) 4
(d) 20​

Answer 1

Answer:

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Your answer is option b

Here is your explanation

Explanation:

H=80J

I=2A

R=R

t=10 sec

H=I^2 Rt

80=(2) ^2 ×R×10

R= 80÷40

R =2Ω

Answer 2

Explanation:

given::

=>current=2 A

=>heat produced = 80 joules

=>time taken = 10 seconds

to find::

resistance of the conductor

solution::

using joule's law of heating,

$\boxed{\red{\tt heat=I^2Rt }}$

where,

R is not known

I is 2 amperes

t is 10 seconds.

applying values,

$\tt ===> 80 = 4×R×10$

$\tt ===> \dfrac{80}{4×10}=R$

$\boxed{\red{\tt ===> 2 = R}}$

thus, the resistance comes out to be 2 ohms

hence, option b is correct..

hope this helps..!!