railway RRB Technician Grade 1 Mock Test 2024 Physics Current, Resistance and Electricity Power in Electric Circuits
A kettle has a coil that operates at 1200 V when connected to a 240 W supply. The resistivity ρ and area of cross-section A of unit length of the coil are related by the equation-
1
\(A =\frac{\rho }{7000}\)
2
\(A =\frac{\rho }{6000}\)
3
\(A =\frac{\rho }{1200}\)
4
\(A =\frac{\rho }{240}\)