Question

53. Two cylindrical wires of the same material have their lengths in the ratio of 4 :
9. What should be the ratio of their radii so that their resistances are in the
ratio of 4 : 1?
54. Two wires of the same metal, have the same area of cross section but their
lengths in the ratio of 3 : 1. What should be the ratio of current flowing
through them respectively, when the same potential difference is applied
across each of their length?
55. Two wires A and B of length 30m and 10m have radii 2 cm and 1cm
respectively. Compare the resistances of the two wires. Which will have less
resistance?
56. Calculate the resistance of 1km long copper wire of radius 1mm. Resistivity of
copper is 1.7 x 10-8 2 m​

Answer 1

Answer:

I didn't know mathematics