Difference between Gravitational and Electromagnetic force
Gravitational force
- The force which attracts towards the centre of planet is known as gravitational force.
- It is the weakest force in the universe.
- Gravitational force is long range force hence it acts between two macroscopic objects.
- Sir Isaac Newton was the first who illustrates the formula for gravitational force in his universal law of gravitation.
- Newton’s law of gravitation states that “Every particle of matter attracts every other particle of matter with the force, which is directly proportional to the product of mass of the particles and inversely proportional to square of distance between the centres of two objects”.
- According to Newton’s law of gravitation,
Contents
Where, G = Universal gravitational constant.
m1 and m2 = masses of object and
r = distance between centres of object
7.) The value of G is determined by Cavendish which is given as,
G = 6.67 × 10-11 N/m2
8.) Eg. High tides, low tides are takes place on the surface of earth due to gravitational attraction between earth and moon.
Electromagnetic force
- The force which between charged particles is known as electromagnetic force.
- It is weak force.
- Electromagnetic force is long range force but it is around 1036 times stronger than that of gravitational force.
- The energy emitted from sun consists of highly energetic photons, which are termed as the particle carrier of electromagnetic force.
- As like gravitational force, it also obeys inverse square law, i.e. its strength decreases with increase in distance.
- According to Coulomb the force of attraction or repulsion between two charges at rest is given by,
7) Electromagnetic force can experience when a current carrying coil is place in uniform magnetic field. This principle is used in the construction of electric motor.