Chapter 21 potential 第八章静电场 ◆电势零点选择方法:有限带电体以无穷远为电势零点, 实际问题中常选择地球电势为零. Choose the potential to be zero at an infinite distance or the ground. E·dZ ◆物理意义把单位正试验电荷从点A移到无穷远 时,静电场力所作的功 Descriptions: y is a property of an electric field, regardless of whether a charged object has been placed in that field; U is an energy associated with a system(the charged object plus the charged particles that set up the electric field)Chapter 21 potential 第八章静电场 电势零点选择方法：有限带电体以无穷远为电势零点， 实际问题中常选择地球电势为零. Choose the potential to be zero at an infinite distance or the ground.     A A V E l   d 物理意义 把单位正试验电荷从点 移到无穷远 时，静电场力所作的功. A Descriptions: V is a property of an electric field, regardless of whether a charged object has been placed in that field; U is an energy associated with a system (the charged object plus the charged particles that set up the electric field)