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An electric heater is plugged into the mains supply using a fused plug. The current in the heater is . The cable attached to the heater is rated at . The fuses available are rated at , , and . Which fuse should be used?
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. The cable attached to the heater is rated at 
. The fuses available are rated at 
, 
, 
and 
. Which fuse should be used?
