题目

阅读短文，回答问题A few months ago, a strange thing happened in my life. I heard a strange sound outside the window every night. I was scared and didn't know what to do. I thought there might be a thief standing outside the closed window. I asked my parents to see what it was. But they found nothing. They thought it might be the wind. But I didn't think so.That lasted for a few days. I couldn't sleep well. Sometimes I even couldn't fall asleep. One day, I bought a flashlight in a market. At midnight, as soon as I heard the strange sound, l jumped out of my bed with the flashlight. I s7．如图所示，带电量为q的正点电荷靠近接地的大金属板，产生类似等量异种电荷产生的电场，点电荷q与金属板间的距离为d，那么点电荷q受到的电场力为（　　）A．k$\frac{{q}^{2}}{{d}^{2}}$B．k$\frac{{q}^{2}}{2{d}^{2}}$C．k$\frac{{q}^{2}}{4{d}^{2}}$D．以上三个答案均错误