Question

At New York City, the earth's magnetic field has a vertical component of 5.20 × 10^-5 T that points downward (perpendicular to the ground) and a horizontal component of 1.80 × 10^-5 T that points toward geographic north (parallel to the ground). What is the magnitude of the magnetic force on a 4.13-m long, straight wire that carries a current of 14.3 A perpendicularly into the ground?

Answer 1

Consider car as a rod of length 1.9 m moving at aspeed of 28 m/s towards downward magnetic field.The direction in which current flows gives the region in which positive charge accumalates.

considen the car as a rod of length = 6.2 x 105T. l=1.am. and Magnetic field Velocity (V) 28 m/s. and drivers side. 28 mis gepresents magnetic field vertically downward . so when the care moves through it passes from right side of car to drivers side. current B IV L

As the induced Current flows towards docvers place, bas ende positive change gets accumalated at his side. EMF, E = Blv 6.25 X 105 x 1.9 x 28 = 332.15 x 105 v 332.5 x 105 v

since drivers side accumalates positive charge the emf is also positive.