How much equal charge should be placed on the earth and the moon so that the electrical repulsion balances the gravitational for
1 answer:
As we know that electrostatic force between two charges is given as
here we know that electrostatic repulsion force is balanced by the gravitational force between them
so here force of attraction due to gravitation is given as
here we can assume that both will have equal charge of magnitude "q"
now we have
now we have
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In a conductor, there is a constant motion of electrons and if you put them in the magnetic field you get the force.
Electromotor always has a static part, which is just a permanent magnet, and it has the conductor. I attached a sketch of a very simple electromotor.
If you trace the current along the conductor you will notice that for some part it is moving away from you and for some part, it is moving towards you. Because of this the forces on opposite sides of the conductor act in the opposite directions and create the torque that makes the conductor rotating.
The basic statement could be something like this:
When there is a current flowing through the conductor it acts as a magnet. If you put that conductor in the permanent magnetic field there will be a force that acts on it. If you carefully arrange the shape of the conductor you can achieve continual motion.