Which of the following statements is not an advantage of an alkaline accumulator?

The diagram above illustrates the wire connections to a three-pin plug. The wires P, Q and R respectively are:

Which of the following statements about parallel plate capacitors is/are correct?

I. Capacitance of the capacitor  is inversely proportional to the distance between the plates

II. Capacitors can filter a.c signals from d.c 

III. Capacitors can store charges

The circuit contains three ammeters A1, A2 and A3 with readings of A2 and A3 shown as indicated in the diagram. Determine the reading of A1.

Which of the following statements about magnetic lines of force is not correct? They