What length of silver wire with a diameter of 0.050cm is needed to make a resistance of 28 ohm. choose from the answers given.

The resistivity of aluminum is 2.82 X 10* -8 Ω. m. HINT (a) Find the resistance of an aluminum wire (in ohms) with a radius of 1.28 mm and a length of 1.03 m. (b) Calculate the volume (in m) of aluminum in the wire. m3 (c) Suppose that volume of aluminum is formed into a new wire with a length of 2.32 m. Find the new resistance of the wire (in ohms).

A copper wire has a resistance of 0.400 2 at 20.0°C, and an iron wire has a resistance of 0.430 at the same temperature. At what temperature (in °C) are their resistances equal? This is all the information given.

A battery has an emf of ε = 19 V, an internal resistance r = 28 22, and is connected to a resistor of R = 75 22. Express the current I through the circuit in terms of ε, r and R. Calculate the numerical value of I in A. Express the terminal voltage 4V of the battery in terms of I and R. Calculate the numerical value of 4V in V.