The force experienced due to difference in the pressure between places is called
Charges Q1 and Q2 are in vacuum initially. Q2 experiences a net force F due to the presence of Q1. They are now placed in a new medium of dielectric constant εrand the relative distance between them is maintained. The new net force experienced by Q2 due to the presence of Q1 is
The force experienced by the magnet is due to the magnetic field of the conductor.