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Chapter 4: Q12DQ (page 777)

If the electric potential at a single point is known, can Eat that point be determined? If so, how? If not, why not?

Short Answer

Expert verified

We can calculate the electric field from the changing of the potential energy. 80, in this case, We can‘t determine the electric energy.

Step by step solution

01

About electric potential

electric potential, the amount of work needed to move a unit charge from a reference point to a specific point against an electric field.Typically, the reference point is Earth, although any point beyond the influence of the electric field charge can be used

02

Determine the electric energy

As We know the electric energy is given by the negative gradient of the electric potential

Solution:

As we mention in the concept session, the electric field is equal to the negative sign of the potential gradient

Therefore we can calculate the electric field from the changing of the potential energy. In this case, We can‘t determine the electric energy.

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In the circuit, in Fig. E26.47 the capacitors are initially uncharged, the battery has no internal resistance, and the ammeter is idealized. Find the ammeter reading (a) just after the switch S is closed and (b) after S has been closed for a very long time.

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