1) The electric potential energy is equal to the product between the electric potential and the charge:
where
q is the charge
V is the electric potential
In our problem, the charge on the rod is
, while its potential energy is
, therefore we can re-arrange the previous formula to get the electric potential at the tip:
2) By using the same formula, If the charge is changed to
, the electric potential will be:
If you wish, you could choose i to be in the same direction as the motion and j in perpendicular direction (upwards).
The two speeds could be expressed as vectors. The speed of the boat is merely
. The speed of the climbing man, using the boat as reference, is more complicated. It is
. Calculate the sums of the two and the speed itself.
The local charging of the comb is due to induction. The negative object's charge pushes electrons in the comb away from the side close to the charged object causing that part to be positively charged. Note that the comb's net charge is still zero provided it doesn't touch the object. When you move the comb away its electrons will redistribute.
Answer:
B.magnitude and direction
Explanation:
Vector is moved from one place to another.
Example: acceleration
only scalar have magnitude only
Example: speed , temperature