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Test prep for ap courses
Two particles with charges +2
q and +
q are separated by a distance
r . The +2
q particle has an electric field
E at distance
r and exerts a force
F on the +
q particle. Use this information to answer questions 31–32.
What is the electric field of the +
q particle at the same distance and what force does it exert on the +2
q particle?
-
E /2,
F /2
-
E ,
F /2
-
E /2,
F
-
E ,
F
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When the +
q particle is replaced by a +3
q particle, what will be the electric field and force from the +2
q particle experienced by the +3
q particle?
-
E /3, 3
F
-
E , 3
F
-
E /3,
F
-
E ,
F
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The direction of the electric field of a negative charge is
- inward for both positive and negative charges.
- outward for both positive and negative charges.
- inward for other positive charges and outward for other negative charges.
- outward for other positive charges and inward for other negative charges.
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When a positively charged particle exerts an inward force on another particle
P , what will be the charge of
P ?
- positive
- negative
- neutral
- cannot be determined
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Suppose that the force exerted on an electron is 5.6×10
−17 N, directed to the east.
- Find the magnitude of the electric field that exerts the force.
- What will be the direction of the electric field?
- If the electron is replaced by a proton, what will be the magnitude of force exerted?
- What will be the direction of force on the proton?
(a) 350 N/C, (b) west, (c) 5.6×10−17 N, (d) west.
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Section summary
- The electrostatic force field surrounding a charged object extends out into space in all directions.
- The electrostatic force exerted by a point charge on a test charge at a distance
depends on the charge of both charges, as well as the distance between the two.
- The electric field
is defined to be
where
is the Coulomb or electrostatic force exerted on a small positive test charge
.
has units of N/C.
- The magnitude of the electric field
created by a point charge
is
where
is the distance from
. The electric field
is a vector and fields due to multiple charges add like vectors.
Conceptual questions
Problem exercises
What is the magnitude and direction of an electric field that exerts a
upward force on a
charge?
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What is the magnitude and direction of the force exerted on a
charge by a 250 N/C electric field that points due east?
N
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(a) What magnitude point charge creates a 10,000 N/C electric field at a distance of 0.250 m? (b) How large is the field at 10.0 m?
(a)
(b)
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Calculate the initial (from rest) acceleration of a proton in a
electric field (such as created by a research Van de Graaff). Explicitly show how you follow the steps in the Problem-Solving Strategy for electrostatics.
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(a) Find the direction and magnitude of an electric field that exerts a
westward force on an electron. (b) What magnitude and direction force does this field exert on a proton?
(a)
(b)
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Questions & Answers
Ayele, K., 2003. Introductory Economics, 3rd ed., Addis Ababa.
can you send the book attached ?
Ariel
the study of how humans make choices under conditions of scarcity
AI-Robot
U(x,y) = (x×y)1/2
find mu of x for y
U(x,y) = (xÃy)1/2
find mu of x for y
Desalegn
this is the study of how the society manages it's scarce resources
Belonwu
macroeconomic is the branch of economics which studies actions, scale, activities and behaviour of the aggregate economy as a whole.
husaini
difference between firm and industry
what's the difference between a firm and an industry
Abdul
firm is the unit which transform inputs to output where as industry contain combination of firms with similar production 😅😅
Abdulraufu
Suppose the demand function that a firm faces shifted from
Qd 120 3P
to
Qd 90 3P
and the supply function has shifted from
QS
20 2P
to
QS
10 2P .
a) Find the effect of this change on price and quantity.
b) Which of the changes in demand and supply is higher?
explain standard reason why economic is a science
factors influencing supply
scares
means__________________ends
resources. unlimited
Jan
economics is a science that studies human behaviour as a relationship b/w ends and scares means which have alternative uses
Jan
calculate the profit maximizing for demand and supply
Why qualify 28 supplies
Milan
out-of-pocket costs for a firm, for example, payments for wages and salaries, rent, or materials
AI-Robot
concepts of supply in microeconomics
identify a demand and a supply curve
there's a difference
Aryan
Demand curve shows that how supply and others conditions affect on demand of a particular thing and what percent demand increase whith increase of supply of goods
Israr
Hi Sir please how do u calculate Cross elastic demand and income elastic demand?
Abari
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Source:
OpenStax, College physics for ap® courses. OpenStax CNX. Nov 04, 2016 Download for free at https://legacy.cnx.org/content/col11844/1.14
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