When we rub one of the given objects on dry hair and place it close to small pieces of paper, they get attracted. Spot that object. Give reason why only that object attracts and other objects don't attract.
(i) Metal pen (ii) Finger of hand (iii) Plastic scale [3 MARKS]
When we rub one of the given objects on dry hair and place it close to small pieces of paper, they get attracted. Spot that object. Give reason why only that object attracts and other objects don't attract.
(i) Metal pen (ii) Finger of hand (iii) Plastic scale [3 MARKS]
Each point: 1 Mark
1. When you rub a plastic scale on your dry hair, the scale can attract very small pieces of paper.
2. By rubbing, the charges transfer from hair and accumulate at the rubbed portion of scale which attracts the paper pieces.
3. But in the case of a finger and metallic pen, the charges transferred from hair to object can flow freely and are not accumulated.
Hence there is no force due to accumulated charge and so these objects cannot attract paper pieces.
Each point: 1 Mark
1. When you rub a plastic scale on your dry hair, the scale can attract very small pieces of paper.
2. By rubbing, the charges transfer from hair and accumulate at the rubbed portion of scale which attracts the paper pieces.
3. But in the case of a finger and metallic pen, the charges transferred from hair to object can flow freely and are not accumulated.
Hence there is no force due to accumulated charge and so these objects cannot attract paper pieces.
