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# Similarities between Gravitational fields and Electric fields

Similarities between Gravitational fields and Electric fields - 09/10/12 Physics lesson w/ Mr Hampshire
by

## Tom Reed

on 16 October 2012

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#### Transcript of Similarities between Gravitational fields and Electric fields

photo credit Nasa / Goddard Space Flight Center / Reto Stöckli By Tom Reed Similarities between Gravitational and Electric fields With both Gravitational and Electrical fields, there can occur uniform and radial fields. Types of field In a uniform Gravitational or Electrical field, all field lines act perpendicular to the surface. All field lines are of equal spacing, signifying a uniform force. In a Gravitational field, the field lines act towards the mass creating the field and show the direction that a test mass would travel. In an electrical field, the field lines point along the direction of travel that a positively charged test charge would take. Uniform fields In a radial field, all field lines point towards the center (origin) of the circular field. Therefore, was the distance (r) from the center increases, the spacing between field lines also increases and this signifies a decrease in attractive force. In a gravitational field, the field lines point from an infinite distance, towards the center of the field circle. In an Electrical field, the field lines point inwards if the charge creating the field is negative and outwards if the charge is positive. Radial fields Gravitational field strength;

g=F/m

g= Gravitational field strength
(Nkg^-1)
F= Force due to gravitational field
(N)
m= Mass of test mass
(kg) Gravitational and Electrical field strengths Electrical potential;

V=Q/(4piEor)

V= Electrical potential
(JC^-1)
1/(4 x pi x Eo)
= Electrical charge constant
8.99x10^9
(mF^-1)
Q= Charge of field creator
(C)
r = Distance between charges
(m) Gravitational and electrical potentials
in a radial field The main difference between Gravitational and Electreic fields is that masses always gravitate towards eachother where charges can attract or repel. Differences Electrical field strength;

E=F/Q

E= Electrical field strength
(NC^-1)
F= Force due to the electric field
(N)
Q= Charge on positive test
(C) Gravitational potential;

V=(-GM)/r

V= Gravitational potential
(Jkg^-1)
G= Gravitational constant
6.67x10^-11
(Nm^2kg^-2)
M= Mass of field creator
(kg)
r= Distance between masses
(m) Thank you for watching
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