A small glass bead has been charged to +20 nC. A small metal ball bearing 1.0 cm above the bead feels a 0.018 N downward electric force. What is the charge on the ball bearing?
The charge of the ball is
We have two charged particles one of them has charge and another has a charge with a distance , the two particles exert forces on each other where the force decrease with the increase in the distance and increase with the increase in magnitude.
Coulomb's law describes:
where K is the electrostatic constant and is given by . The charge of the bead is given by Convert unit into Coulomb by
In nC, the charge of the ball is
The ball is above the bead and the force is downward, which means the glass bead attracts the ball downward, towards the bead, therefore, the two charges are not same. As the bead is positively charge, the charge of ball is negative.
Four lightweight balls are suspended by threads. Ball has been touched by a plastic rod that was rubbed with wool. When the balls are brought close together, without touching, the following observations are made:
• Balls are attracted to ball
• Balls have no effect on each other.
• Ball is attracted to ball
What are the charge states (glass, plastic, or neutral) of balls ? Explain.
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