In a conductor of length l and area of cross section A, if vd is the drift velocity of the charge carriers of charge q having a number density of n, then what is lABnqvd if B is the magnetic field ?
Answer & explanation
Correct answer: option 2
lABnqvd
lA = Volume(V)
nqV = Total Charge(Q)
$\Rightarrow lABnqv_d = Qv_dB = \text{ Magnetic Force}$