A copper cable is 1.2km long and has a cross-sectional Area of 5mm².Find it's resistance at 80°C if at 20°C the resistivity of copper is 0.02×10^-6 ohm m and it's temperature coefficient of resistance is 0.004/°C.
the coil of the wire has a resistance of 10ohms at 0°C.If the temperature coefficient of resistance for the wire is 0.004/°c.find its resistance at 100°C.
How to find the equivalent resistance between two mid points of two sides of a square while 2 resistors are connected to the other 2 sides and 4 other in diagonals