Two wires of equal length, one of copper and the other of manganin have the same thickness. Which one will be used for its
electrical transmission lines?

Two wires of equal length, one of copper and the other of manganin have the same thickness. Which one will be used for its electrical heating devices? Why?

Two wires of equal lengths, one of copper and the other of manganin, have the same resistance. Which wire is thicker?

Two wires of equal lengths, one of copper and the other of manganin, have the same resistance. Which wire is thicker?

Two wires of equal length, one of aluminium and the other of copper have the same resistance. Which of the two wires is lighter? Hence explain why aluminium wires are preferred for overhead power cables. ( rho_Al = 2.63 xx 10^-8 Omega m, rho_Cu = 1.72 xx 10^-8 Omega m . Relative density of A1 = 2.7, of Cu = 8.9.)

Two copper wires, one of length 1 m and the other of length 9 m, are found to have the same resistance. Their diameters are in the ratio

Two spheres of the same radii, one solid and other hollow are charged to the same potential, which one has greater charge?

Two identical loops, one of copper and other of aluminium are rotated with the same speed in the same magnetic field. In which case the induced emf and induced current will be more? Why?

Two wires of equal lengths are bent in the form of two loops. One of the loops is a square shaped whreas the other loop is circular. These are suspended in a uniform magnetic field and the same current is passed through them. Which loop will experience greater torque? give reasons.