A charge moving in a straight line enters a uniform electric or magnetic field. If the linear velocity of this charge is not affected, this field could only have been a magnetic field, not an electric field.Group of answer choicesTrueFalse

At any point, the magnetic field lines are in the direction ofA the magnetic force on a moving negative charge B the velocity of a moving positive charge C the velocity of a moving negative charge D none of the above

If an electron is travelling horizontally towards east. A magnetic field in vertically downward direction exerts a force on the electron along*1 pointeastwestnorthsouthIf a charged particle is moving along a magnetic field line. The magnetic force on the particle is*1 pointalong its velocityopposite to its velocityperpendicular to its velocityZeroA magnetic field exerts no force on*1 pointa stationary electric chargea magnetan electric charge moving perpendicular to its directiona non-magnetized iron barAn electron beam enters a magnetic field at right angles to it as shown in the figure. The direction of force acting on the electron beam will be*1 pointTo the leftto the rightinto the planeout of the plane

Charge X is in a region of uniform magnetic field while charge Y isseparately in a region of uniform electric field. If both charges are initially held at rest,which of the following best describes the motion of the charges after they are released?(Neglect gravitational effects)A. Only charge X acceleratesB. Only charge Y acceleratesC. Both charges accelerateD. Neither of the charges acceleratesE. X will change direction, Y willaccelerate

The trajectory of a charged particle is the same as a field line. Is this statement true or false?

In what direction will a negatively charged particle accelerate in an electric field?Group of answer choicesIn the same direction as fieldIn opposite direction as fieldPerpendicular to fieldImpossible to tell