The resistance of a 100-cm wire of cross sectional area 2× 10 -6 m 2 is 400 . Wh

Question

The resistance of a 100-cm wire of cross sectional area 2× 10-6 m2 is 400 . Whatis the resistivity of the material of this wire? You are given a copper bar of dimensions 3 cm × 5 cm× 8 cm and asked to attach leads to it in order to make aresistor. If you want to achieve the largest possible resistance,you should attach the leads to the opposite faces thatmeasure Four unequal resistors are connected in a parallel circuit.Which one of the following statements is correct about thiscircuit? The resistance of a 100-cm wire of cross sectional area 2× 10-6 m2 is 400 . Whatis the resistivity of the material of this wire? Answer 8 ×10-4 m 0.8 ×10-5 m 0.8 ×10-4 m 0.8 ×10-6 m 8 ×10-6 m

Explanation / Answer

1) the R=l/S where is the resistivity so =RS/l=8e-4 (m) A 2) R=l/S=*l^2/Sl=*l^2/V because V is constant so to achieve the highest resistance the length must be highest so i choose 35 3)It is The total resistance is less than the smallest resistor. This can be conclude directly from the equivalent resistance of aparallel circuit.

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