An electron would produce an electromagnetic wave when it is
- stationary.
- in a stable hydrogen atom.
- moving at a constant velocity.
- moving at a constant speed in a circular path.
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An electron would produce an electromagnetic wave when it is
\(D\)
→ Maxwell predicted that an accelerating charge will produce an electromagnetic wave.
→ As the electron moves at a constant speed in a circular path it must be experiencing an acceleration.
\(\Rightarrow D\)
Which statement describes how an electromagnetic wave is propagated?
`C`
→ As per Maxwell’s predictions, an oscillating electric field induces an oscillating magnetic field perpendicular to the electric field.
→ This oscillating magnetic field induces an oscillating electric field perpendicular to it. This process continues and an electromagnetic wave is propagated.
`=>C`
The diagram shows a model of electromagnetic waves.
Relate this model to predictions made by Maxwell. (4 marks)
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→ The diagram shows alternating electric and magnetic fields oscillating perpendicular to each other. This relates to Maxwell’s prediction of mutual inductance; that a changing electric field induces a changing magnetic field and vice versa.
→ The diagram shows the electromagnetic wave propagating with velocity `v `. This relates to Maxwell’s prediction of a range of waves with different wavelengths, all travelling at the same speed where `c=(1)/(sqrt(mu_(0)epsilon_(0)))`.
→ The diagram also shows an electromagnetic wave emanating from an oscillating charge. This is consistent with Maxwell’s prediction that an oscillating electric charge produces a changing electric field, which in turn produces a changing magnetic field. These fields continue to mutually induce each other, producing an electromagnetic wave.
→ The diagram shows alternating electric and magnetic fields oscillating perpendicular to each other. This relates to Maxwell’s prediction of mutual inductance; that a changing electric field induces a changing magnetic field and vice versa.
→ The diagram shows the electromagnetic wave propagating with velocity `v `. This relates to Maxwell’s prediction of a range of waves with different wavelengths, all travelling at the same speed where `c=(1)/(sqrt(mu_(0)epsilon_(0)))`.
→ The diagram also shows an electromagnetic wave emanating from an oscillating charge. This is consistent with Maxwell’s prediction that an oscillating electric charge produces a changing electric field, which in turn produces a changing magnetic field. These fields continue to mutually induce each other, producing an electromagnetic wave.