Correct Answer - Option 4 : 5 × 10
2 A
CONCEPT:
Electric current:
- The flow of electric charges through a conductor constitutes an electric current.
- Quantitatively, electric current in a conductor across an area held perpendicular to the direction of flow of charge is defined as the amount of charge flowing across that area per unit time i.e.,
\({\rm{Electric\;curernt\;}}\left( {\rm{I}} \right) = \frac{{{\rm{Electric\;charge}}\;\left( {\rm{Q}} \right)}}{{{\rm{Time\;}}\left( {\rm{t}} \right)}}\)
- SI unit of current is ampere and it is denoted by the letter A.
CALCULATION:
Given: positive charge q+ = 5 C, negative charge q- = 2.5 C, and time taken = 5 ×10-3 sec
\(\Rightarrow Current =\mathrm{\frac{net\: charge}{time\: taken}}=\mathrm{\frac{q_{+}-q_{-}}{time\: taken}}\)
\(\Rightarrow Current =\boldsymbol{\mathrm{}\frac{5-2.5}{5× 10^{-3}}}=5 \times 10^2A\)