Question

1. A heating coil is made up by winding the nichrome wire of radius r = 1.00 mm and length L = 120 m. If the voltage of 120 V is applied across the coil, what power is dissipated in it? (The resistivity of nichrome is 1.50x10^-6 Ω · m).

If the voltage is kept the same, which of the following statements is (are) correct:

1. If the wire were longer, the power would be greater;
2. If the wire were longer, the power would be lesser;
3. If the radius of the wire were larger, the power would be lesser;
4. If the radius of the wire were larger, the power would be greater;
5. A and C;
6. B and D.

Answer 1