Aslam is welder by profession who was working at Mohan's house. After making a 'railing' by using electric welding with naked eyes, Aslam was using a grinder on it to smoothen the welding joints. Just then some particle fell into Aslam's eye. He started crying with pain. Mohan hired an auto and took him to an eye hospital. In the hospital, doctor used a device connected to two electric wires to remove the particle from Aslam's eye. Aslam asked Mohan what had fallen into his eye and what device was used by the doctor to remove that particle from the eye. Being a science student of class X, Mohan explained everything to Aslam and asked him to be careful in future.
(a) What could be the particle which fell into Aslam's eye ?
(b) What device was used by the doctor to remove the particle and how it worked?
(c) What precautions should be observed by Aslam while doing electric welding and grinding work ?
(d) What values are shown by Mohan during this episode ?

Explanation

(a) An iron particle fell into Aslam's eye while using the grinder on iron railing.
(b) The doctor used an electromagnet to remove the tiny iron particle form Aslam's eye. Electromagnet is a powerful magnet and the iron particle in the eye is strongly attracted by the electromagnet, stick to the electromagnet and gets removed.
(c) Aslam should use some device to protect his eyes while doing electric welding or using a grinder. Such en eye-protecting device can be welding helmet, hand held shield or welding goggles.
(d) Mohan showed the values of (i) Ability to handle a serious situation with calmness, and (ii) Desire to help others (by rushing Aslam to an eye hospital).