To answer this question, we need to understand the concept of electrical force in an electric field.
In an electric field, charged particles experience a force called the electrical force. This force is directly proportional to the magnitude of the charge on the particle and the strength of the electric field.
Out of the given options, gamma rays, alpha particles, beta particles, and electrons, gamma rays are neutral particles and do not carry any charge. Therefore, they do not experience any electrical force in an electric field.
On the other hand, alpha particles, beta particles, and electrons are charged particles. They can experience electrical forces in an electric field based on their charge and the strength of the electric field.
Therefore, the correct answer is A) Gamma ray. Gamma rays experience the least electrical force in an electric field since they are neutral particles and do not carry any charge.