![electric field intensity electric field intensity](https://image.slidesharecdn.com/electricfields-090324121245-phpapp01/95/electric-fields-12-728.jpg)
Does electric field strength depend on the quantity of charge on the test charge? The value of the proportionality constant ‘k’ in coulomb’s law is 9.0×10 9 N.m 2/C 2.ģ). What is the value of the proportionality constant ‘k’? The electric field is defined as the force per unit charge.Ģ). Thus, the dimensional formula for electric field strength is MLT -3A -1. The dimensional formula for coulomb for ampere-sec is AT. The dimensional formula for force(newton) for the unit kg.m/s 2 is MLT -2. Then the electric field strength E is calculated as E = F/q Here, the force F and the charge ‘q’ are given. Thus, when the distance is increased by the factor of 2, the electric field intensity will decrease by the factor of 4.Ĭalculate the electric field strength acting on a particle with charge -1.6×10 -19 C when the electric force is 5.6×10 -15N. When these conditions are applied to the inverse square law, the relation between the electric field strength (E1) at a distance d1 and the electric field intensity (E2) at distance (d2) is given as. Not dependent on the charge on the test charge ‘q’.Directly proportional to the charge ‘Q’ on source charge.It is inversely proportional to the distance between the source and test charges.Thus, the electric force ‘F’ is given asįrom the formula of electric field intensity, it was derived that. This law gives the relation between the charges of the particles and the distance between them. The formula for electric field strength can also be derived from Coulomb’s law. From Coulomb’s LawĮlectric field intensity is also known as the electric field strength. It is measured the same all around the source charge regardless of the charge of the test charge particle. The electric field intensity is independent of the amount of charge on the test charge particle. When considered in SI units the units of electric field intensity are Newton per coulombs. Here, the charge on the test charge particle is considered rather than the charge on the source charge particle. Thus, the electric field intensity ‘E’ is given as Now, the magnitude of the electric field strength can be defined as ” the force per charge on the test charge”. When a test charge is placed in the electric field it will experience either an attractive electric force or a repulsive electric source. Let the charge on the test charge be ‘q’. This external charge particle which is used to measure the electric field strength is called the test charge. The strength of the electric field created by the source charge can be calculated by placing another charge in its electric field. Since this charged particle is the source of the electric field, it is referred to as a source charge. This charged particle creates an electric field around it. Let us consider a charged particle with charge ‘Q’. Whereas for a negatively charged test charge the direction of force for electric field strength will be towards the source charge particle. Thus, the electric field strength will be directed in the direction away from the charge. So, when a positive test charge particle is introduced to this electric field it will experience a repulsion force.
![electric field intensity electric field intensity](https://d2vlcm61l7u1fs.cloudfront.net/media/9d4/9d4abd31-31fc-40b1-b6cd-53b2b0f60b66/phpPwhWW5.png)
For deriving the direction of electric field intensity, the test charge is considered to be a positive charge. The direction of the electric field is determined by the charge on the test charge particle. The test charge can be either a positively charged particle or a negatively charged particle. It only depends on the amount of charge present on the test charge particle. The electric field strength is independent of the mass and velocity of the test charge particle. The test charge that is subjected to the electric field of the source charge, will experience force even if it is in a rest position. The amount of force experienced by a unit charged particle when it is placed in the electric field is known as Electric field intensity.Įlectric Field Intensity is a vector quantity. Whenever a unit test charge is placed in this electric field it will experience the force emitted by the source particle. This space around the charged particles is known as the “ Electric field“. Every charged particle creates a space around it in which the effect of its electric force is felt. The charge of an electron is about 1.602×10 -19 coulombs. Definition: Electric charge is carried by the subatomic particles of an atom such as electrons and photons.