The electric field lines between two point charges can intersect at any point in
ID: 1597226 • Letter: T
Question
The electric field lines between two point charges can intersect at any point in the region between the two charges. ___ Two charges of the same magnitude and sign are placed a certain distance apart. There is only one point in space near them where the electric field is zero. It must be on the line joining the charges and between the charges. ____ The force of attraction between two unlike charges is inversely proportional to the square of the distance separating the charges. ____ An electric dipole of moment is placed in a uniform external electric field. The dipole moment vector is in the positive y direction. The external electric field vector is in the positive x direction. If the dipole is to have minimum potential energy, the dipole should be in the negative x direction. ____ Electric field lines begin on negative charges (or at infinity) and end on positive charges (or at infinity). ____ The number of electric field lines leaving a positive charge or entering a negative charge is inversely proportional to the charge. ____ Electric field lines cross midway between charges that have equal magnitude and sign. ____ The density of the lines (the number per unit area perpendicular to the lines) is proportional to the magnitude of the field at that point. ____ The direction of each line indicates the direction that a positively charged particle would move if placed at that point in the electric field. ____Explanation / Answer
1] False. Electric field lines do not intersect.
2] True. For like charges (both positive or both negative), there exists only one point in space where the electric field is zero and this is between them.
3] True. Inverse square law for electrostatics.
4] True. The energy will be zero if the dipole is perpendicular to the direction of electric field and will be most negative when it is anti-parallel to the direction of electric field.
5] False. They originate from positive charge and end at negative charge.
6] False. It is directly proportional to charge and not inversely proportional.
7] True. Electric field lines cross midway such that the net electric field at the center is zero.
8] True. The density of lines (Electric Flux) is directly proportional to the magnitude of field at that point.
9] True. Direction of each electric field line indicate where a positive charge will accelerate because of the electric field at that point.
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