Question

A bar slides vertically between two conducting rails without friction in a magnetic field. The rails are connected via a resistor. The bar reaches a constant velocity and slides for 2m. How much energy is dissipated in the resistor during these 2m's

Answer 1

The energy dissipated is
`E = 9.8 J`

Step-by-step explanation:

From the question we are told that

The distance covered at constant velocity d = 2 m

The velocity is
`v = 1.5 \ m/s`

Generally at constant velocity the magnetic force on the bar is mathematically represented as

`F = m * g`

substituting values

`F = 0.5 * 9.8`

`F = 4.9 \ N`

The energy dissipated is mathematically evaluate as

`E = F * d`

substituting the value

`E = 4.9 * 2`

`E = 9.8 J`