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Which of the following can generate a propagating electromagnetic wave?

1. A charge moving with uniform velocity
2. A charge at rest
3. A particle with no charge
4. A charge undergoing acceleration

Correct answer: A charge undergoing acceleration

Solution

A charge undergoing acceleration creates a changing electric field, which in turn generates a changing magnetic field, allowing for the propagation of electromagnetic waves. In contrast, a charge at rest or moving with uniform velocity does not produce such changes.

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