If a wire of resistance 20Ω is covered with ice and a voltage of 210 V is applied across the wire, then the rate of melting of ice is Option 1) 0.85g/s Option 2) 1.92g/s Option 3) 6.56g/s Option 4) none of these

As we learnt in

Power dissipiated in external resistance -

-

Rate of energy produces

Energy required to melt one gm of ice = mL = 1   80  4.2 J = 336J/g

Rate of ice melting =

Option 1)

0.85g/s

Incorrect

Option 2)

1.92g/s

Incorrect

Option 3)

6.56g/s

Correct

Option 4)

none of these

Incorrect