The electric field strength at a point in space is a measure of the force experienced by a positive test charge placed at that point. It represents the intensity of the electric field and is defined as the force per unit positive charge. Mathematically, the electric field strength (E) is given by the equation E = F/q, where F is the force experienced by the test charge and q is the magnitude of the test charge.

The electric field, on the other hand, refers to the overall influence or effect that an object with charge has on its surroundings. It is a vector quantity, meaning it has both magnitude and direction. Electric field lines are used to represent the direction and strength of the electric field in a given region. The closer the field lines are, the stronger the field.

To compare the strengths of different electric fields, we can use the concept of electric field strength. The magnitude of the electric field strength at a point is directly proportional to the force experienced by a positive test charge placed at that point. Therefore, a higher electric field strength corresponds to a stronger force experienced by the test charge.

For example, let's consider two point charges, one with a charge of +2C and the other with a charge of -4C. The electric field strength at a point near the +2C charge will be larger compared to a point near the -4C charge. This is because the force experienced by the test charge will be greater in the vicinity of the +2C charge due to its stronger electric field.