Ms. Nita Chander found that her son could not hear properly. The specialist prescribed hearing aid for her son. Hearing aids consist of electromagnets in the loudspeakers used in the device. (a) What two values does Ms. Nita exhibit towards her son and students ? Mention any two. (b) What is an electromagnet ? In what way its hysteresis curve is different from that used for permanent magnets ?
(a) Caring attitude, sensitive towards society, and concern for others. (b) It is a temporary magnet made by magnetising a soft iron core by passing electric current.