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As shown in Fig. AB is rod of length 30 ...


As shown in Fig. AB is rod of length 30 cm and area of cross section 1.0`cm^2` and thermal conductivity 336 SI units. The ends A and B are maintained at temperatures `20^@C` and `40^@C`, respectively .A point C of this rod is connected to a box D, containing ice at `0^@C` through a highly conducting wire of negligible heat capacity. The rate at which ice melts in the box is (assume latent heat of fusion for ice `L_f=80 cal//g`)

A

`84mg//s`

B

`84 g//s`

C

`20mg//s`

D

`40mg//s`

Text Solution

Verified by Experts

The correct Answer is:
D
`(d theta)/(dt) = (dm)/(dt) L_(f) = ((4-0)/(2))xxKA+((20-0)/(1))KA`
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