Astrip of copper 150 µm thick and 4.50 mm wide is placed in a uniform magnetic field of magnitude b = 0.74 t, that is perpendicular to the strip. a current i = 18 a is then sent through the strip such that a hall potential difference v appears across the width. calculate v. (the number of charge carriers per unit volume for copper is 8.47 × 1028 electrons/m3.)

V = 6.55*10^{-6} v

Explanation:

The number density can be determined by using below formula:

where,

B  is uniform magnetic field 0.74

i is current 18 A

V is hall potential difference

l is thickness 150 MICRO METER

e is electron charge 1.6 *10^{-19} C

therefore V can be determined as

V = 6.55*10^{-6} v

this is poiselle's equation from fluid mechanic in physics. mech eng

d₁ = displacement of tern from arctic to antarctic = 11000 miles

d₂ = displacement of tern from antarctic to arctic =   - 11000 miles

d = total displacement for the journey

total displacement for the journey is given as

d = d₁ + d₂

d = 11000 + (-11000)

d = 0 miles

t₁ = time of travel from arctic to antarctic = 3 months = 3 x 30 days = 90 days

t₂ = time of travel from antarctic to arctic = 3 months = 3 x 30 days = 90 days

t = total time of travel

total time of travel is given as

t = t₁ + t₂

t = 90 + 90

t = 180 days

average velocity is given as

average velocity = total displacement/ total time

v = d/t

v = 0/180

v = 0 miles/day