Question 1
Figure 1 shows a current-carrying conductor AB in a magnetic field.
- Indicate the direction of force F acting on the conductor
- State one factor that determine the magnitude of the force F other than current
Answer
- Length of the conductor
Question 2
A girl standing at a distance claps her hands and hears an echo from a tall building 2 seconds later. Determine how far the building is. (Take the speed of sound in air =340m/s)
Answer
Question 3
State two ways in which one can increase the strength of an electromagnet
Answer
-increase magnitude of curent
-increase the of the wire of the coil
-increase the of the wire of the coil
Question 4
Figure 2 show two mirrors inclined at 60o to each other.
Complete the ray diagram to show how it travels after striking the two mirrors and find the angle of reflection on each surface.
Answer
Question 5
An electric heater rated 240V, 3000W is to be connected to a 240V mains supply through a 10A fuse. Determine whether the fuse is suitable or not
Answer
On earthing negative charges are repelled to the ground. When the rod is withdrawn, the leaf is left with a net positive charge. The leaf rises.