Along uniformly charged thread (linear charge density λ= 2.5 c/m) lies along the x axis in the figure.(figure 1) a small charged sphere (q= -2.3 c) is at the point x=0cm, y=−5.0cm what is the direction of the electric field at the point x=7.0cm, y=7.0cm? e ⃗  thread and e q represent fields due to the long thread and the charge q, respectively. what is the magnitude of the electric field at the point x=7.0cm, y=7.0cm

Answer 1) The electric field at distance r from the thread is radial and has magnitude  

E = λ / (2 π ε° r)  

The electric field from the point charge usually is observed to follow coulomb's law:  

E = Q / (4  π ε° )  

Now, adding the two field vectors:  

 =  {2.5 / (22 π ε° X 0.07 ) ; 0}  

Answer 2)  = {2.3 / (4 2 π ε°) ( - 7/ (√(84); -12 / (√84))

Adding these two vectors will give the length which is magnitude of the combined field.  

The y-component / x-component gives the tangent of the angle with the positive x-axes.

Please refer the graph and the attachment for better understanding.

answer would be letter choice (a),   a ball resting on a shelf. would be another example of potential energy   >   stored energy > not moving.

a ball spinning on a finger   >   kinetic energy > moving energy

a ball rolling on the ground   >   kinetic energy   > moving energy

a   ball flying through the air   > kinetic energy   >   moving energy

hope that                                         : )

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