Explanation
The potential to which a conductor is raised depends on the amount of charge.
The labeled points in the figure will have same electric potential as the full shaded point is three.
Torque about Q of charge –q is zero, so angular momentum is constant. But distances between charge is changing so force is changing and hence speed and velocity is changing.
The inner surface of cavity will be –Q due to induction. At outer surface, the charges will be +Q and at a point between Pˈ at a position r (a<r<R) will be zero.
When a comb runs through one’s dry hair, then comb gets charged and when it comes close to paper, it induces opposite charges in paper. The field due to the charges in comb, polarizes the atoms in the paper. Finally it attracts paper.
Charge will be induced in the conducting sphere, but net charge on it will be zero.
Coulomb’s law is not responsible to bind the protons and neutrons in the nucleus of an atom.
Electric force acting on proton and electron will be equal as proton and electron both have same charge.
When uniform electric field is switched on positively charged block experience a constant force in the direction of Electric field and so the position shifted. But frequency (V) of oscillation is unchanged. It’s depends only on the mass.Therefore, the amplitude of oscillation is qE/K.
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