Question

the figure 2 below shows a simple cell connected to a low resistance bulb
(a) name the part labelled a. (1 mark)
(b) it is observed that the bulb lights only for a short period of time. explain their observation. (2 marks)

1. the figure below shows the magnetic field pattern around two bar magnets placed side by side. indicate on the diagram the poles of each magnet. (1 mark)
2. repulsion is the only test for polarity of a magnet. explain (1 mark)

Explanation:

(a) Part A is the electrolyte in the simple cell, which allows ion flow between electrodes.
(b) Polarization occurs: hydrogen bubbles form on the copper rod, increasing internal resistance and stopping current flow.
(6) Magnetic field lines show attraction between adjacent poles, so Magnet 1 left = N, right = S; Magnet 2 left = N, right = S (or vice versa if lines curve between same poles, but attraction implies opposite adjacent poles).
(7) Attraction can happen with a magnet and unmagnetized magnetic material, but repulsion only occurs between like poles of two magnets.

Answer:

(a) Electrolyte
(b) Polarization (hydrogen bubbles on copper) increases resistance, stopping current.
(6) Magnet 1: Left pole = North, Right pole = South; Magnet 2: Left pole = North, Right pole = South (adjacent poles are opposite).
(7) Repulsion only occurs between like poles of two magnets, while attraction can involve unmagnetized materials.