A bar of n-type Ge of size 0.010m × 0.001m × 0.001m is mounted in a magnetic field of 0.2 T. The electron density in the bar is 7 × $10^{21}/m^3$. If 1 mV is applied across the long ends of the bar,Assume $μ_e = 0.39 m^2/Vs$. -

Mumbai university > FE > SEM 1 > Applied Physics 1

Marks: 5M

Year: May 2013

Given:-

$l = 0.01m, w = 10^{-3}m , d = 10^{-3}m$

Magnetic field, B=0.2T

Electron density, $n = 7 × 10^{-21}/m^3$

Potential difference, $V_A = 1mV = 10^{-3}V$

$µ_e = 0.39m^2/Vs$

To find:-

(i) Current (I)

(ii) Hall voltage$(V_H)$

Solution:-

Conductivity is given as,

$σ = µne$

Resistance of conductor, …