While watching Discovery channel Sheela was impressed that certain organisms have the ability to sense the field lines of earth's magnetic field. They use this ability to travel from one location to another, Sheela wanted to find the angle of dip at her place. She then mounted the compass on a cardboard and placed it vertically along the magnetic meridian. She was able to measure the angle of dip
(a) What values did Sheela have?
(b) Define the magnetic element of earth.

Babita and Sheela class XII students were assigned a project based on magnetism.In their project work, they calculated the value of earth's magnetic field.When they submitted their project work for verification.
Mr.Raj, their physics teacher, corrected the mistake.Hew also suggested few books which could be of use to them.
What values did Mr.Raj exhibit towards his students? Mention any two.

A Ramesh while doing his physics practical in a class, found that if a voltmeter, an ammeter and a resistance are connected in series to a lead accumulator, there is deflection in the voltmeter but the deflection in ammeter is negligible. He discussed his problem with all his class fellows but no one could explain the reason. Harshpreet was also studying in his class. When he discussed the problem with her, she explained the reason and then whole class was informed by both of them.
(a) What was the reason for deflection in voltmeter and negligible deflection in the ammeter?
(b) What value were displayed by Ramesh and Harshpreet?