A very sensitive spring balance was used to determine the weight of an object at the north pole. When the same spring balance was used to measure the weight of the same object at the equator, it was found to reduce. The explanation for this observation is that
A.
it is very hot at the equator
B.
the spring balance has expanded
C.
the acceleration of free fall due to gravity varies with location
The diagram above illustrates a Hare's apparatus. \(\mathit{e}_1, \mathit{e}_2\) represent densities and \(\mathit{h}_1, \mathit{h}_2\) heights of columns of liquids. Which of the following equations is correct?
A.
\(\mathit{h}_1 = \frac{\mathit{h}_2 \mathit{e}_1}{\mathit{e}_2}\)
B.
\(\mathit{h}_1 = \frac{\mathit{h}_2 \mathit{e}_2}{\mathit{e}_1}\)
C.
\(\mathit{h}_1 = \frac{\mathit{e}_1 \mathit{e}_2}{\mathit{h}_2}\)
D.
\(\mathit{h}_1 = \frac{\mathit{e}_1}{\mathit{h}_2 \mathit{e}_2}\)
The diagram above illustrates a bar magnet near a coil connected to a galvanometer, When the magnet is rapidly moves towards the coil i. e.m.f. is induced in the coil ii. the galvanometer needle deflects iii. the magnet is attracted by the coil. Which of the statements above is/are correct?
