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Question

An X-ray can be deflected:

This question was previously asked in
CDS 2 2025 Maths Question Paper (14-Sep-2025)
The correct answer is
neither by electric field nor by magnetic field.

X-ray Nature Explained

To understand how X-rays interact with electric and magnetic fields, we first need to know what X-rays are. X-rays are a form of high-energy electromagnetic radiation, just like visible light, radio waves, or gamma rays. They travel at the speed of light (\(\textit{c}\)) and consist of photons. Importantly, photons have no net electric charge.

Field Interactions with X-rays

Electric and magnetic fields exert forces on particles based on their properties:

  • Electric Fields: An electric field exerts a force on any particle that has an electric charge. The force is given by the equation \(\vec{F} = q\vec{E}\), where \(\vec{F}\) is the force, \(q\) is the charge of the particle, and \(\vec{E}\) is the electric field vector. A charged particle (like an electron or proton) will accelerate in the direction of the force, causing its path to deflect.
  • Magnetic Fields: A magnetic field exerts a force on a *moving* charged particle. The force is given by the equation \(\vec{F} = q(\vec{v} \times \vec{B})\), where \(\vec{v}\) is the velocity of the particle and \(\vec{B}\) is the magnetic field vector. This force causes the path of the moving charged particle to curve.

Why X-rays Aren't Deflected

Since X-rays are composed of photons, and photons are electrically neutral (meaning their charge \(q = 0\)), they do not experience any force from either an electric field or a magnetic field.

  • In an electric field: \(\vec{F} = 0 \times \vec{E} = \vec{0}\)
  • In a magnetic field: \(\vec{F} = 0 \times (\vec{v} \times \vec{B}) = \vec{0}\)

Because no force acts upon them, X-rays travel in straight lines undisturbed by these fields.

Conclusion on X-ray Deflection

Based on their nature as electrically neutral electromagnetic radiation, X-rays cannot be deflected by electric fields or magnetic fields.

Therefore, the correct statement is that X-rays can be deflected:

  • neither by electric field nor by magnetic field.
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