70 10
×
×
  = 820 °C
that is,  T2 = (820 + 27 0) °C = 847 °C
Thus, the steady temperature of the heating element (when heating
effect due to the current equals heat loss to the surroundings) is
847 °C Rationalised 2023-24
Physics
92
 EXAMPLE 3 4
Example 3