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What condition is necessary for electric charge to flow from one end of a metal bar to another?
• Temperature difference. The electric charge flows from the end with higher temperature to the end with lower temperature.
• Pressure difference. The electric charge flows from the end with lower pressure to the end with higher pressure.
• Temperature difference. The electric charge flows from the end with lower temperature to the end with higher temperature.
• Electrical potential difference. The electric charge flows from the end with higher potential to the end with lower potential.
• Electrical potential difference. The electric charge flows from the end with lower potential to the end with higher potential.
• Pressure difference. The electric charge flows from the end with higher pressure to the end with lower pressure.



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