A student suggests that there are several ways of transferring energy to a small, stationary block of iron on a smooth table. He makes the following suggestions.
1 Heat it.
2 Shine light on it.
3 Pass a current through it.
Which suggestions are correct?
1 )
1 and 2 only
2 )
1 and 3 only
3 )
2 and 3 only
1, 2 and 3
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