(a) (i) State the rule used to find the force acting on a current carrying conductor placed in a magnetic field. (ii) Given below are three diagrams showing entry of an electron in a magnetic field. Identify the case in which the force will be (1) maximum and (2) minimum respectively. Give reason for your answer. OR (b) (i) Draw the pattern of magnetic field lines of (1) a current carrying solenoid (2) a bar magnet (ii) List two distinguishing features between the two fields.

Hint

Use the Fleming's Left Hand Rule to find the force acting on a current carrying conductor placed in a magnetic field. Analyze the diagrams showing entry of an electron in a magnetic field and identify the case in which the force will be maximum and minimum respectively. Draw the pattern of magnetic field lines of a current carrying solenoid and a bar magnet. List two distinguishing features between the two fields.

Quick oral answer

The Fleming's Left Hand Rule is used to find the force acting on a current carrying conductor placed in a magnetic field. The force will be maximum when the electron is moving perpendicular to the magnetic field and minimum when the electron is moving parallel to the magnetic field. The magnetic field lines of a current carrying solenoid are circular and closed, while the magnetic field lines of a bar magnet are straight and open. The magnetic field of a current carrying solenoid is stronger near the center of the solenoid, while the magnetic field of a bar magnet is stronger near the poles.