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# Physics: Electric Field, strength, charge, intensity

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Electric Field

1. What is the field strength at a reference point if a force of 40N is necessary to hold a charge of 200uC at that point?

2. A charge of -2 x 10-9C in an electric field between two parallel metal plates 4cm apart is acted upon by a force of 10-4N. What is the strength of the field?

3. Find the electric field intensity at a point P midway between two charges of +2.0 x 10-7C if they are 100cm apart?

https://brainmass.com/physics/electric-magnetic-fields/physics-electric-field-strength-charge-intensity-296684

#### Solution Preview

1. What is the field strength at a reference point if a force of 40N is necessary to hold a charge of 200uC at that point?

Solution: A charge q placed at a point where electric field intensity is E experiences a force of magnitude qE.

F = qE

Substituting the given values: 40 = 200x10-6E

E = 40/200x10-6 = 2 x 105 N/C

2. A charge of -2 x 10-9C in ...

#### Solution Summary

Electric field, strength, charge and intensity is examined.

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