(i) Battery as well as a cell helps in maintaining a potential difference across a conductor. This makes the current flow. 

(ii) If 1 J of work is required to move a charge of amount 1 C from one point to another, then it is said that the potential difference between the two points is 1 V. 

(iii) The energy given to each Coulomb of charge is equal to the amount of work required to move it. 

Thus, we have 

W = V * q 

= 6 * 1 

= 6 J 

(iv) Magnetic fields can be pictorially represented by magnetic field lines, 

the properties of which are as follows: 

• The field is tangent to the magnetic field lines. 

• Field strength is proportional to the line density. 

• Field lines cannot intersect 

• Field lines are continuous loops. 

• Magnetic field lines emerge from the North Pole and terminate at the South pole outside the magnet. Inside the magnet, the direction of the magnetic field lines is from the South Pole to the North Pole.

(v) The magnetic field lines never intersect each other because if two or more lines intersect each other, then it means that at that point of intersection, the magnetic field has two directions at the same point. This is not possible for a magnetic field to point in more than one direction at the same point.