Directions : (6-10) |
Factors Affecting Resistance |
According to Ohm's law, the current flowing through a conductor is directly proportional to the potential difference across the ends of the conductor i.e. \[I\propto V\]\[\Rightarrow \,\frac{V}{I}=R\], where R is resistance of the conductor. |
Electrical resistance of a conductor is the obstruction posed by the conductor to the flow of electric current through it. It depends upon length, area of cross-section, nature of material and temperature of the conductor. |
We can write, \[R\propto \frac{l}{A}\]or\[R=\rho \frac{l}{A}\], where p is electrical resistivity of the material of the conductor. |
A) \[\left[ M{{L}^{2}}{{T}^{-2}}{{A}^{-2}} \right]\]
B) \[\left[ M{{L}^{2}}\,{{T}^{-3}}\,{{A}^{-2}} \right]\]
C) \[\left[ {{M}^{-1}}\,{{L}^{-2}}\,{{T}^{-1}}\,A \right]\]
D) \[\left[ {{M}^{-1}}\,{{L}^{2}}\,{{T}^{2}}\,{{A}^{-1}} \right]\]
Correct Answer: B
Solution :
\[\left[ M{{L}^{2}}\,{{T}^{-3}}\,{{A}^{-2}} \right]\]You need to login to perform this action.
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