The voltage across a circuit (a) can be increased if resistors are circuit in beesan be increased if resistors are added to a circuit in parallel ased if resistors are added to a circuit in series (d) is neither increased nor decreased by adding resistors to a circuit. 14 two light bulbs are connected in a sircuit. when one light bulb burns out, the r continues to give off light. these light bulbs are connected in (a) seres ) parallel (c) short circuit (d) there is not enough information to answer this question. 15 prevents the circuit from a dangerous increase in (a) current (b) voltage (c) resistance (d) none of these. 16 south pole of when a magnet is broken into two pieces (a) one resulting piece has a but no north pole, and the other has a north pole but no south pole (b) one the resulting pieces is magnetized and the other is not (c) each resulting picce sh one north pole and one south pole (d) both resulting pieces are gts (a) cannot be sciecly plained sieranetic felds are not te a magnetic field when they generated by a moving electrical field (b) only genera are shaken back and forth (c) are created when the spinning electrons within a material align and reinforce each other's magnetic fields (d) are created when pinning electrons within a material move out of alignment and disrupt each other's magnetic fields. the a compass is placed beside a wire. when an electric current is passed through the wire (a) the compass needle aligns with the wire's magnetic field (b) the compass needle aligns with the earth's magnetic field (c) the compass needle is not affected by the current in the wire because the electric field is not moving (d) the compass needle will point to the earth's geographic north pole in particle accelerators, magnets are not used to increase the speed of electrically charged particles (though they are used to direct the path of the particles.) from your knowledge of magnets and forces, which of the following state best explains this fact? (hint: you may find it to review section 14.2 in your textbook.) (a) magnetic forces always act parallel to the motion of a charged particle; they have a component of motion along the charged particle's direction of motion, and therefore cannot be used to increase the particle. (b) magnetic forces always act 19. speed of a perpendicular to the motion of a charged le: they have no component of motion along the charged particle's direction therefore cannot be used to increase the speed of a particle of motion, (c) magnetic forces are too weak to significantly affect the motion of a charged e. (d) magnetic forces are so strong that they would accelerate the particles to dangerous speeds.