Electirc field -pointing vectors

Deduce direction of E vectors carefully. See applet

TAsk 7: Coulomb's Law

The force between two charges are known as electrostatic force. Go to link and write down the equation for the coulomb's law. You should replace the symbol d with r , distance between the charges.
Go to link to compare the Coulomb's law with the Universal law of gravitation.

TAsk 6: Action -Reaction

The force on charge q1 placed at a distance r from q2. The force on q1 is F=q1E where E is the field strength of q2 , E=k q2/r2 . Put together these two formulas to deduce the expression for force F on q1. Write the expression in the space on the right.
The force on charge q2 placed at a distance r from q1. The force on q2 is F=q2E where E is the field strength of q1 , E=kq1/r2. Put together these two formulas to deduce the expression for force F on q2. Write the expression in the space on the right.
Draw in the same diagram above the E-vector due to charge q1 at q2 and also the force on q2.
Compare the two forces in terms of its direction and magnitude.

TAsk 5:Magnitude of E -vector

The equation for E-vector for a point charge , E= k q/r2, where q is the charge of the source at the centre and r is the distance away from the charge.
Go to link to find value of k
Write down the expression of the formula that can be used to find the E-vector between two parallel plates where V is the potential difference between the plates and d the separation of the plates.

TAsk 4: Force on charge placed in an electric field

The force F=qE is used to find the magnitude of the force. The direction of the force is in the same direction as E for a positive charge placed at that point. Indicate in the diagram the direction of the force on a positive charge and negative charge placed inside the parallel plates .

TAsk 3: Postive and negative charges

The E vectors shown is for a source of positive charge?Draw another diagram for a source of negative charge.

TAsk 2: Electric field

Draw E vector at any four locations for the arrangement of charges in the diagram above.

Link to finding more field patterns . Draw one other field pattern of your choice in the empty space on the right.

TAsk 1: electric field

The diagram shows electric field lines around two charges. The red arrows shows the electric field strength E -vector(E net) at some locations indicated by red arrows originating at some points around the two charges. link provided here to see how magnitude of charge can change field lines