Explain why increasing temperature weakens a magnet, why it is not advisable to light a cigarette near a charging battery, and indicate the direction of the force on conductor AB.

Step 1: Explain why increasing temperature weakens a magnet. When the temperature of a magnet increases, the kinetic energy of the magnetic domains within the material also increases. This causes the domains to vibrate more vigorously and randomly. This increased thermal agitation disrupts the alignment of the magnetic domains, making them less ordered. The overall effect is a reduction in the net magnetic field, thus weakening the magnet. If the temperature reaches the Curie point, the magnet loses its magnetism entirely. Step 2: Give a reason why it is not advisable to light a cigarette near a charging battery. Charging batteries undergo electrolysis, which produces hydrogen gas. Hydrogen gas is highly flammable and can form an explosive mixture with air. Lighting a cigarette produces a flame or spark, which could ignite this hydrogen-air mixture, leading to an explosion. Step 3: Indicate the direction of the force on conductor AB. To determine the direction of the force, we use Fleming's Left-Hand Rule. • The magnetic field lines go from the North pole to the South pole, so the field is directed from left to right. • The current flows from the positive terminal to the negative terminal. In the diagram, the current enters at A and exits at B, meaning the current flows into the page (assuming the circuit is behind the conductor). Applying Fleming's Left-Hand Rule: • Forefinger (Field): Points to the right. • Middle finger (Current): Points into the page. • Thumb (Force): Points downwards. Therefore, the force on the conductor AB is directed downwards. Step 4: State two characteristics of an image formed by a concave mirror when the object is placed at a distance less than the focal length. When an object is placed between the pole and the principal focus (F) of a concave mirror, the image formed has the following characteristics: • It is virtual. • It is erect (upright). • It is magnified (enlarged). • It is formed behind the mirror. Step 5: Give two reasons why Alpha particles are more ionizing than Beta particles. Alpha particles are more ionizing than Beta particles due to the following reasons: • Charge: Alpha particles have a charge of +2e, which is twice the magnitude of the charge of a Beta particle (-1e). This larger charge allows Alpha particles to exert a stronger electrostatic force on the electrons of atoms they pass near, leading to more frequent ionization events. • Mass and Speed: Alpha particles are much more massive than Beta particles (approximately 7300 times more massive). For a given kinetic energy, Alpha particles travel at significantly lower speeds than Beta particles. This means Alpha particles spend more time in the vicinity of atoms, increasing the probability of interaction and ionization. Their larger mass also makes them less easily deflected, allowing for more direct and sustained interactions with atomic electrons. That's 2 down. 3 left today — send the next one.