Scientific work is currently underway to determine whether weak oscillating magnetic fields can affect human health. For example, one study found that drivers of trains had a higher incidence of blood cancer than other railway workers, possibly due to long exposure to mechanical devices in the train engine cab. Consider a magnetic field of magnitude 1.00 10-3 T, oscillating sinusoidally at 72.5 Hz. If the diameter of a red blood cell is 7.60 µm, determine the maximum emf that can be generated around the perimeter of a cell in this field.

Given Information:

Magnetic field = B = 1*10⁻³ T

Frequency = f = 72.5 Hz

Diameter of cell = d = 7.60 µm = 7.60*10⁻⁶ m

Required Information:

Maximum Emf = ?

Answer:

Maximum Emf = 20.66*10⁻¹² volts

Explanation:

The maximum emf generated around the perimeter of a cell in a field is given by

Emf = BAωcos (ωt)

Where A is the area, B is the magnetic field and ω is frequency in rad/sec

For maximum emf cos (ωt) = 1

Emf = BAω

Area is given by

A = πr²

A = π (d/2) ²

A = π (7.60*10⁻⁶/2) ²

A = 45.36*10⁻¹² m²

We know that,

ω = 2πf

ω = 2π (72.5)

ω = 455.53 rad/sec

Finally, the emf is,

Emf = BAω

Emf = 1*10⁻³*45.36*10⁻¹²*455.53

Emf = 20.66*10⁻¹² volts

Therefore, the maximum emf generated around the perimeter of the cell is 20.66*10⁻¹² volts