Which of the following will not show deflection from the path on passing through an electric field?
Proton, cathode rays, electron, neutron.

Explanation

To determine which of the following particles will not show deflection from the path when passing through an electric field, we need to analyze the charge of each particle mentioned in the options: proton, cathode rays, electron, and neutron.

### Step-by-Step Solution:

1. **Understanding Deflection in Electric Fields**:
- Charged particles experience a force when they pass through an electric field, which causes them to deflect from their original path. The direction of deflection depends on the charge of the particle (positive or negative).
- Neutral particles, on the other hand, do not experience any force in an electric field and therefore do not deflect.

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