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Two wires are of the same length, same r...

Two wires are of the same length, same radius, but one of them is of copper and the other is of iron. Which will have more resistance?

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Iron has more resistance
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Two wires of equal length, one of aluminium an 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 _(AI) =2.63 xx 10 ^(-8) Omega m, rho _(Cu) =1. 72 xx 10 ^(-8) Omega m. Relative density of Al =2. 7 of Cu =8.9. )

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Knowledge Check

  • A rectangular conducting loop consists of two wires on two opposite sides of length l joined together by rods of length d . The wires are each of the same material but with cross-section differing by a factor of 2.The thicker wire has a resistance R and the rods are of low resistance,which in turn are connected to a constant voltage source V_(0) .The loop is placed in uniform a magnetic field B at 45^(@) to its plane. Find the torque exerted by the magnetic field on the loop about an axis through the centres of rods

    A
    `tau = (1)/(4 sqrt(2)) (V_(0) AB)/(R)`
    B
    `tau = (1)/(2 sqrt(2)) (V_(0) AB)/(R)`
    C
    `tau = (V_(0) AB)/(R)`
    D
    `tau = (sqrt(2)V_(0) AB)/(R)`

  • The following four wires of length L and radius r are made of the same material .Which of these will have the largest extension,when the same tension is applied?

    A
    L=100 cm,r=0.2 mm
    B
    L=200 cm, r=0.4 mm
    C
    L=300 cm,r=0.6 mm
    D
    L=400 cm,r=0.8 mm

  • Two physical quantities, of which one is a vector and the other is a scalar, having same dimension are :

    A
    moment and momentum
    B
    power and pressure
    C
    impulse and momentum
    D
    torque and work.

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    Two wires of equal length, one of copper and the other of manganin [an alloy] have the same thickness. Which one can be used for i] electrical transmission lines ii] electrical heating devices? Why?

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    Four wires each of same length, diameter and material are connected to each other to form a square. If the resistance of each wire is R , then equivalent resistance across the opposite comers is :

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