Electromagnetic Induction

Q1.When a magnet is moved into a solenoid, the induced current in the solenoid creates a pole that:

• AAttracts the approaching magnet
• BRepels the approaching magnet
• CHas no effect on the magnet
• DDeflects the magnet sideways

Q2.Motional EMF in a rod of length L moving with velocity v perpendicular to a magnetic field B is:

• Aε = BLv/2
• Bε = BL/v
• Cε = BLv
• Dε = B²Lv

Q3.Transformer works on which principle?

• ASelf-induction only
• BMutual induction
• CEddy currents
• DElectromagnetic radiation

Q4.A conducting rod slides on two parallel conducting rails of separation L in a magnetic field B perpendicular to the plane. The rod has resistance r and rails have resistance R (total). The current through the circuit when rod moves with velocity v is:

• ABLv/(R+r)
• BBLv/R
• CBLv/r
• DBLv/L

Q5.In Faraday's experiment, when does maximum flux linkage occur with a bar magnet and a coil?

• AWhen magnet is far away
• BWhen magnet moves at maximum speed
• CWhen magnet is at rest inside the coil (fully inserted)
• DWhen magnet moves away