Physics
Which is evidence that supports the dynamo theory?

Earth's outer core contains liquid that conducts electricity
Convection occurs in Earth's inner core
Earth's core contains a large amount of iron
Granite and basalt conduct electricity

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Physics
In the process of magnetisation of a bar

The entire bulk of the bar gets magnetised
Only the surface of the bar gets magnetised
Only the ends of the bar get magnetised
Only some parts of the outer layers of the bar get magnetised

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