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6. Comparison
between gravitational and electric fields
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Gravitational |
Electrostatic |
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1 |
Origin of force=
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Due to mass
interaction |
Due to charge
interaction |
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2 |
Nature of force=
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Only attraction=
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Either attracti=
ve
(between opposite charges) or repulsive between similar charges)
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3 |
Inverse square =
Law |
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Coulomb’s
law:
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4 |
Field strength
(definition) Vector |
Force per unit =
mass
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Force per unit
positive charge
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5 |
Field strength =
due
to an isolated point mass M=
/
charge Q |
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Equation
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6 |
Field strength<=
span
style=3D'mso-spacerun:yes'> due to 2 point masses M / charge=
s Q
system |
At A, Resultant g =3D
vector sum of |
At A, Resultant E =3D
vector sum of |
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|
7 |
Potential
(definition) scalar |
Work done by an external agent in bring unit mass from infinity to that=
point
in the gravitational field =
(J kg-1)
|
Work done by an external agent in bring unit positive charge from infin=
ity to
that point in the electric field
(J C-1)
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|
8 |
Potential due t=
o an
isolated point mass M / charge Q |
Equation:
|
Equation
|
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9 |
Potential due t=
o 2
point masses M / charges Q system |
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|
10 |
Potential energy
(definition) scalar |
Work done by an
external agent in bringing a mass from infinity to that p=
oint
in the gravitational field =
(J) |
Equation |
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|
11 |
Potential energ=
y of
2 masses / 2 charges system |
Equation
|
 =
; &n=
bsp;  =
; &n=
bsp;
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|
12 |
Relationship
between field and potential |
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13 |
Relationship
between force and potential energy |
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