Bala and Rama class X students, were assigned they had calculated the value of the earth's magnetic field. When they submitted their project for verification, Mr. Santosh, their physics teacher, corrected the mistakes. He also suggested few books which could be of use to them.
(a) What values did Mr. Santosh exhibit towards his students ? Mention any two.
(b) Mention the three magnetic elements required to
calculate the value of the earth's magnetic field, and draw a neat diagram to explain them.