physical significance of electric field
Answers
Electric Field Physical Significance
Under Static Condition
Under the static condition, an electric field characterizes the electrical environment surrounding a system of charges. It is defined at every point and varies from point to point.
Electromagnetic Non-Static Condition
Under this condition, the accelerated motion of the charge gives rise to electromagnetic waves that propagate with a speed c and impart a force on another charge. Time-dependent magnetic and electric fields are associated with the transport of energy.
The electric field is independent of the test charge and is a characteristic of a system of a charge. The interaction between charges is electromagnetic in nature.
The true physical significance of the electric field emerges when we deal with time-dependent electromagnetic phenomena. Consider two distant charges q1 and q2 in accelerated motion. The effect of motion of q1 on q2 doesn’t arise instantaneously. There will be a time difference between the effect and the cause. This time delay is accounted for by the electric field as follows: The accelerated motion of q1 gives rise to electromagnetic waves. These waves travel at a speed of c and reach the charge q2 and impart a force on it. This accounts for the time delay.
Although electric and magnetic fields can only be detected by their effects (forces) on charges, they are perceived as physical entities, not merely mathematical constructs. They possess an independent dynamics of their own, in other words, they evolve according to laws of their own. They also carry energy. Therefore, a source of time-dependent electromagnetic fields turned on momentarily and switched off, leaves back-propagating electromagnetic fields carrying energy. The concept of the field was first introduced by Faraday and is now one of the central concepts in physics.
Answer:
Electric Field Physical Significance
Under Static Condition
Under the static condition, an electric field characterizes the electrical environment surrounding a system of charges. It is defined at every point and varies from point to point.
Electromagnetic Non-Static Condition
Under this condition, the accelerated motion of the charge gives rise to electromagnetic waves that propagate with a speed c and impart a force on another charge. Time-dependent magnetic and electric fields are associated with the transport of energy.
The electric field is independent of the test charge and is a characteristic of a system of a charge. The interaction between charges is electromagnetic in nature.
The true physical significance of the electric field emerges when we deal with time-dependent electromagnetic phenomena. Consider two distant charges q1 and q2 in accelerated motion. The effect of motion of q1 on q2 doesn’t arise instantaneously. There will be a time difference between the effect and the cause. This time delay is accounted for by the electric field as follows: The accelerated motion of q1 gives rise to electromagnetic waves. These waves travel at a speed of c and reach the charge q2 and impart a force on it. This accounts for the time delay.
Although electric and magnetic fields can only be detected by their effects (forces) on charges, they are perceived as physical entities, not merely mathematical constructs. They possess an independent dynamics of their own, in other words, they evolve according to laws of their own. They also carry energy. Therefore, a source of time-dependent electromagnetic fields turned on momentarily and switched off, leaves back-propagating electromagnetic fields carrying energy. The concept of the field was first introduced by Faraday and is now one of the central concepts in physics
Explanation:
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