CBSE Physics Set- III Solved Question Paper 2012, given here.
Q.1Why is the potential inside a hollow spherical charged conductor constant and has the same value as on its surface?
Ans.1 There is no electric field inside a shell. Potential is the amount of work done in moving a test charge, and since the field is absent inside the shell, the potential is constant inside it.
Q.2A magnetic needle free to rotate in a vertical plane orients itself vertically at a certain place on the Earth. What are the values of (i) horizontal component of Earth’s magnetic field and (ii) angle of dip at this place?
Ans.2 A magnetic needle orients itself vertically on poles. Hereboth (i) horizontal component of Earth’s magnetic field is zero. (ii) angle of dip is zero.
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