15. When an iron rod is inserted into a sollemond coil's center, the magnetie the loops A. causes the fron to rethomh to all unmagnetized state b. forces the domain in the fron one of alignment C. causes random orientation of the domains in the iron d causes alignmen of the domains in the iron 16. Which of the following modifications to a solenoid would be most magnetic field? a.removing its iron rod core and increasing the number of coil b. increasing the current and reducing the number of coils C. reducing the number of coils and inserting an iron core d. decreasing the current and reducing the number of coils 17. According to the right-hand rule if a current -carrying wire is in the direction of the current,the four fingers will curl in the C.the cur F_(magnetic). a.the magnetic force, b. the magnetic field B. d. the cu The lines of the magnetic field around a current-carrying a.point away from the wire. b. point toward the wire. C.form concentric circles around the wire. d. are parallel with the wire. Under which of the following conditions is the net mag a. when the particle is stationary . when the particle is moving parallel to the magne when the particle is not charged all of the above