Electric Field Strength (E)
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The Electric Field Strength calculator computes the electric field strength based on the force and charge.
INSTRUCTIONS: Choose units and enter the following:
- (F) Force
- (q) Charge
Electric Field Strength (E): The calculator returns the field strength in volts per meter. However, this can be automatically converted to compatible units via the pull-down menu.
The Math / Science
Electric field Strength can be defined as the electric force per unit charge. The direction of the field is taken to be the direction of the force it would exert on a positive test charge. The electric field is radially outward from a positive charge and radially inward toward a negative point charge.
E = Fe/q
Where:
- E = Electric Field
- F = Force
- q = Charge
Electric field strength is a vector quantity; it has both magnitude and direction.
The magnitude of the electric field strength is defined in terms of how it is measured. Let's suppose that an electric charge can be denoted by the symbol . This electric charge creates an electric field; since is the source of the electric field, we will refer to it as the source charge.
The strength of the source charge's electric field could be measured by any other charge placed somewhere in in proximity to . The charge that is used to measure the electric field strength is referred to as a test charge since it is used to test the field strength.
The test charge has a quantity of charge denoted by the symbol . When placed within the electric field, the test charge will experience an electric force - either attractive or repulsive. As is usually the case, this force will be denoted by the symbol . The magnitude of the electric field is simply defined as the force per charge on the test charge.
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