How does current density vary with increase in length?
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If potential difference V is applied across a conductor of length 'l' and area of cross-section 'A' having number of free electrons per unit volume n. ... (a) current density increases with increase in potential gradient . (b) when temperature increases, relaxation time (τ) decreases and current density decreases.
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in length the current increase with the resistance and it is directly propotional to current
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