Basics 3 – Electric Field

Basics 3 – Electric Field

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This segment is on Electric field moving on to Voltage and Current and their inter-dependency. This may go slightly ugly so am keeping all my base thought through Newtonian mechanics and I am not going into quantum theory.

Electric field:

Electric field is 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 in toward a negative point charge.Do you know why? That’s where potential and Energy Comes in!!!!

I did find this pic in hyperphysics : they have a good contribution of these data.

 

Apart from these there are a few more definitions to Electric Field. We know that force is always a vector resultant. Electric field is force per charge, Which gives that Electric field is also a vector resultant. (yes, We need those wherever direction is important.)

 mathbf{F}=qleft(frac{Q}{4pivarepsilon_0}frac{mathbf{hat{r}}}{|mathbf{r}|^2}right)=qmathbf{E}

 

So there comes a question! How do we study them ???

Here’s the answer: Electric Field Lines!!

I want to make it simple so am putting it short and sweet!

  1. Lines begin and end only at charges (beginning at + charges, ending at – charges) or at Infinity.

  2. Lines are closer together where the field is stronger.

  3. Larger charges have more field lines beginning or ending on them.

  4. Electric Field lines never cross (since E must point in a definite direction unless it is zero).

  5. At any location, the direction of the electric field is tangent to the electric field line that passes through that location.

I have put up a video from youtube to make things easier if you have trouble.

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