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A wooden block floats in fresh water. A 1 kg sealed metal tool can either be placed gently on top of the block (remaining above the water) or suspended from the block by a light string so the tool is fully submerged but not touching the bottom. In both cases the system is at rest. Which statement must be true when the tool is submerged compared with when it is on top?
A bench transformer has 1200 turns on the primary and 60 on the secondary. It is connected to 240 V rms and powers a 12 V halogen lamp drawing 2.0 A rms at its rated brightness. The transformer is 80% efficient under this load. Which value must the rms current in the primary coil have?
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