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Q2: A proton,which moves perpendicular to a magnetic
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Q18: A circular loop carrying a current of
Q19: A 10-turn square coil of area 0.036
Q19: A high-voltage power line 26.9 m above
Q21: A metal wire has a resistance of
Q25: The temperature coefficient of resistivity is a
Q35: A water pump draws about 3.7 A
Q42: In an AC series circuit,the voltage in
Q44: The magnetic force on a charged particle