Calculate the frequency of a pendulum of length 1.2 m on a planet with gravitational field strength of 15. (g= 9.8m/s2) 2marks 2. A simple pendulum oscillates with simple harmonic motion with an amplitude of 0.3 m. The frequency of the oscillations is 5 Hz. Calculate the speed of the pendulum at a position of 0.1 m from the equilibrium position. 2marks 3. The diagram shows a bar magnet. (i) Copy the diagram and show on it the magnetic field lines around the magnet. 2marks (ii) Describe an experiment to plot the magnetic field lines around the magnet. 2marks (iii) Name a metal that is attracted to a magnet. 1mark (iv) State two practical uses of a magnet. 1mark 4. Calculate the force on an aluminium foil if its length is 10 cm and a current of 1.5 A flows through it when it is placed in a magnetic field of flux density 3.0 T 2marks. 5. (i) Who discovered that an electric current could deflect a compass needle? (ii) What did Arago discover? (iii) What happens when current flows in the same direction in two parallel wires? 1mark. (iv) How could two parallel wires be made to repel each other? 1mark. (v) Draw a sketch of the apparatus Michael Faraday used to generate electricity. 2marks (vi) What name is given to the generation of electricity discovered by Michael Faraday? 1mark (vii) What energy conversions that take place in Faraday’s experiment 1mark (viii) How does Faraday’s experiment show that a changing magnetic field is required to generate electricity?