# Induced EMF

## Homework Statement

A 11.2m long steel been is dropped from a height of 9.51m. The horizontal component of the earth's over the region is 18.5x10^-6T. What's the emf in the beam impact just before the impact with the earth, assuming its long dimension remains in a horizontal plane, oriented perpendicularly to the horizontal component of the earth's magnetic field?

e= mag flx/t

## The Attempt at a Solution

A= 1/2*b*h
A=1/2 x 11.2 x9.51= 53.36

18.5e-6* 53.26
but theres no time

Redbelly98
Staff Emeritus
Science Advisor
Homework Helper

## Homework Statement

A 11.2m long steel been is dropped from a height of 9.51m. The horizontal component of the earth's over the region is 18.5x10^-6T. What's the emf in the beam impact just before the impact with the earth, assuming its long dimension remains in a horizontal plane, oriented perpendicularly to the horizontal component of the earth's magnetic field?

e= mag flx/t

## The Attempt at a Solution

A= 1/2*b*h
A=1/2 x 11.2 x9.51= 53.36
That would be the area of a triangle, but I fail to see the relevance???

18.5e-6* 53.26
but theres no time

My own hunch is that the electric and magnetic forces on a test charge Q in the beam would have to be equal in magnitude, opposite in direction.

So, what is the magnetic force on a charge Q?