defence exam ITBP (Telecommunication) Head Constable Mock Test 2024 Physics Current, Resistance and Electricity Drift of Electrons and the Origin of Resistivity
Which of the following equation shows the relationship between current (i) and drift velocity (Vd). (n is number of free electrons/m3, A is the cross-sectional area, e is change on an electron, R is resistance)
1
Vd = I R2
2
I = neAVd
3
Vd = IR
4
Vd = I2Rt