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Chapter 22: Q. 39 (page 625)

A smart phone charger delivers charge to the phone, in the form of electrons, at a rate of-0.75C/s . How many electrons are delivered to the phone during 30min of charging?

Short Answer

Expert verified

Delivered electrons are8.4脳1021electrons.

Step by step solution

01

Calculation for charge

Charge is,

Q=Ne

Where e=-1.6脳10-19C.

So,

N=Qe

The rate of accumulation of the electrons is ,

Qt

=-0.75C/s

For time t=30min,

Where,

t=30min=30(60s)

=1800s

So,

Q=(-0.75C/s)t

=(-0.75C/s)(1800s)

=-1350C

02

Calculation of electrons

Electron is,

N=Qe

=-1350C-1.6脳10-19C

=8.4脳1021electrons

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Most popular questions from this chapter

In Problems 69 through 72 you are given the equation(s) used to solve a problem. For each of these,

  1. Write a realistic problem for which this is the correct equation(s).
  2. Finish the solution of the problem.

鈭�Fx=2脳(9.0脳109Nm2/C2)(1.0脳10鈭�9C)q((0.020m)/sin30鈭�)2脳cos30鈭�=5.0脳10鈭�5N鈭�Fy=0N

In Problems 69 through 72 you are given the equation(s) used to solve a problem. For each of these,

  1. Write a realistic problem for which this is the correct equation(s).
  2. Finish the solution of the problem.

(9.0脳109Nm2/C2)(15脳10鈭�9C)r2=54,000N/C

Charged plastic and glass rods hang by threads.

a. An object repels the plastic rod. Can you predict what it will do to the glass rod? If so, what? If not, why not?

b. A different object attracts the plastic rod. Can you predict what it will do to the glass rod? If so, what? If not, why not?

What are the strength and direction of the electric field 1.0 mm from (a) a proton and (b) an electron?

Two 1.0 kg masses are 1.0 m apart (center to center) on a frictionless table. Each has +10 mC of charge.

a. What is the magnitude of the electric force on one of the masses?

b. What is the initial acceleration of this mass if it is released and allowed to move?
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