Thread: pls let me know the answers

1. An electric dipole of dipole moment p is kept parallel to an electric field of intensity E. The work done in rorating the dipole throgh an angle 90 deg is .....?

options: 0, -pe, pe, -2pe

2. which of the following devices has a source of emf inside it?

options: voltmeter, ammeter, ohmmeter, rectifier.

1. Do your own homework.

2. What is the energy difference between the two states?
3. Think to yourself, just what is ElectroMagenticForce?