电 场（Electric field）.docVIP

电 场（Electric field） Documents from the network, I collected, finishing, and if there are omissions, errors, but also please correct me! Physical examination for senior three (eight) (electric field) First, the multiple-choice question: 1, about the electric field intensity of the narrative, the correct is: A, along the power line direction, the field strength is getting smaller and smaller The field strength at a point in the electric field of B is the electric force at which the charge of the unit electric charge is at that point C, the fastest direction of potential drop is the direction of field strength The electric field formed by D and negative point charge is closer to the point charge, and the field strength is greater 2, if a punctual charge is placed in an electric field, it is released without initial velocity, in the course of the motion of the point charge, A, the trajectory of the point charge motion must coincide with the power line The acceleration direction of the positive charge of the B is always consistent with the tangent line of the power line at its location C, the velocity direction of the point charge is always consistent with the tangent line of the power line at its location D, the total energy of the point charge becomes larger and larger E=5.0 field 3, uniform electric field x 103 V / m, to make a negative charge at 3 * 10-15 base charge along at an angle of 60 degrees direction and the direction of the electric field for uniform linear motion, the magnitude and direction of force applied should be: A, 1.5 * 10-11 cattle, with field direction of 120 degrees B, 1.5 * 10-11 cattle, with field direction of 60 degrees C, 1.5 * 10-11 cattle, the same direction as field strength D, 1.5 * 10-11 cattle, contrary to field strength 4 and two identical metal spheres A and B, A is positively charged, B is negatively charged, and the ratio of QA to QB is 4 to 1. If a point charge of C is placed at a point on the A and B lines, QC, A and B are just ba