Question 1
The figure 1 below shows a positively charged metal plate with an earthing connection. Using an arrow, show the direction of charges through the earth connection and explain the final charge of the plate
Answer
The electrons flow from the earth and neutralizes all the positive charges in the plate leaving the plate neutrally charged
Question 2
Figure 2 below shows a metre rule in equilibrium balanced by the magnet and weight. The iron core is fixed to the bench
State and explain the effect on the metre rule when the switch S is closed
Answer
The metre rule will tip in anticlockwise direction. This is because when the switch S is closed the iron core becoming magnetized with the top of the core becoming a south pole hence attracts the north pole of the magnet
Question 3
State two factors affecting the type of shadow formed by an object placed infront of a source of light.
Answer
- The size of the source of light
- The size of the opaque object
- Distance between the object and source of light.
- Distance between the object and source of light.
Question 4
Distinguish between intrinsic and extrinsic semi – conductors
Answer
Intrinsic semi conductor charge correct and the delocalized electrons .In ixtrinsic semi conductor conduction is enhanced by doping
Question 5
Figure 3 shows a galvanometer connected to a coil with a south pole of a permanent magnet approaching the coil
Indicate the direction of the pointer on the galvanometer when the bar magnet is moved as shown.
Answer
