Physics - Current Electricity Question with Solution | TestHub

An ionisation chamber, with parallel conducting plates as anode and cathodes, has$5\times {10}^7\mathrm{ }\mathrm{c}{\mathrm{m}}^{-3}$electrons and the same number of singly charged positive ions per$\mathrm{c}{\mathrm{m}}^3$.The electrons are moving toward the anode with velocity 0.4$\mathrm{m} {\mathrm{s}}^{-1}$. If current density$\mathit{\text{J}}=4\times 10^{-6} {\text{A m}}^{-2}$then the velocity of positive ions moving towards cathode is