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Two wires of equal diameters of resistiv...

Two wires of equal diameters of resistivities `p_1 and p_2` and length` x_1` and `x_2` respectively are joined in series. The equivalent resistivity of the combination is

A

`(P_1X_1+P_2X_2)/(X_1+X_2)`

B

`(P_1X_2-P_2X_1)/(X_1-X_2)`

C

`(P_2X_2+P_2X_1)/(X_1+X_2)`

D

`(P_1X_2- P_2X_1)/(X_1+X_2)`

Text Solution

Verified by Experts

The correct Answer is:
D
When a resistance is connected parallel to voltmeter the effective resistence decreases
According to ohm's law, V = 1R
When R decreases , I increase and V decreases
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