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According to Joule's law, if the potenti...

According to Joule's law, if the potential difference across a conductor having a material of specific resistance remains constant, then the heat produced in the conductor is directly proportinal to

A

`rho`

B

`rho^(2)`

C

`1/(sqrt(rho))`

D

`1/(rho)`

Text Solution

Verified by Experts

The correct Answer is:
D
`H = (V^2)/(r_ T) R=(rhol)/(A)`
H prop 1/(rho)`
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Knowledge Check

  • The potential difference across a conductor is doubled, the rate of generation of heat will

    A
    become one fourth
    B
    be halved
    C
    be doubledtimes
    D
    become four times

  • When a potential difference (V) is applied across a conductor, the thermal speed of electrons is

    A
    zero
    B
    proportional to `sqrtT`
    C
    proportional to (T)
    D
    proportional to V

  • A source of constant potential difference is connected across a conductor having irregular cross section as shownthen

    A
    electric field intensity at P is greater than that at Q
    B
    rate of electrons crossing per unit area of cross-section at P is less than that at Q
    C
    the rate of generation of heat per unit length at P is greater than at Q
    D
    mean kinetic energy of free electrons at P is greater than that at Q

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    A potential difference of 100 V is applied across a wire of resistance 50 Omega for one minute. Find the heat produced in joule.

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