$show \: that \\ (a - b) (a + b) = (a {}^{2} - b {}^{2} ) \\ \: \: \: \: \: \: \: \: \: \: \: \: \\ (x {}^{a} - {}^{b} ) {}^{a} - {}^{b} \times (x {}^{b} - {}^{c} ) {}^{b} + {}^{c} \times (x {}^{c} - {}^{a} ) {}^{c} + {}^{a}$ solve it ...

the drift velocity of free electron in a conductor is V then a current I is flowing in it if both the radius and current are doubled then the Drift velocity will become​

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the drift velocity of free electron in a conductor is V then a current I is flowing in it if both the radius and current are doubled then the Drift velocity will become