Question

The voltage across a circuit (A) can be increased if resistors are added to circuit in series (B) can be increased if resistorsct i sries (D) is nell (C) can be decreased if resistors are are added to a circuit in increased nor decreased by adding resistors to bulb burns out, other continues to give off light. These light bulbs are connected in (A) se the (B) parallel (C) short circuit (D) there is not enough information to answeries 14,- Two light bulbs are connected in a circuit. When one light bulb burns 2l er A circuit breaker prevents the circuit from a dangerous increase in (A) (B) voltage (C) resistance (D) none of these. 15. When a magnet is broken intotwo pieces(A).one resulting piece hasa but no but no north pole, and the other has a north pole but no south pole (B) the resulting pieces is magnetized and the other is not (C) each resultin is a magnet with one north pole and one south pole (D) both resulting i Piece south pole of pieces are 6. ー ae not when the 17 Magnets (A) cannot be scientifically explained since their magnetic field generated by a moving electrical field (B) only generate a magneticfl within a are shaken back and forth (C) are created when the spinning electrons material align and reinforce each other's magnetic fields (D) are spinning electrons within a material move out of alignment and disnu magnetic fields. A compass is placed beside a wire. When an electric current is passed throuoha wire (A) the compass needle aligns with the wire's magnetic field (B) the needle aligns with the earth's magnetic field (C) the compass needle is not by the current in the wire because the electric field is not moving (D) the co needle will point to the earth's geographic North Pole. 19. In particle accelerators, magnets are not used to increase the speed of elec charged particles (though they are used to direct the path of the particles.) From your knowledge of magnets and forces best explains this fact? (Hint: You may find it helpful 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 speed of a which of the following statements particle. (B) Magnetic forces always act perpendicular to the motion of a charged particle, they have no component of motion along the charged particle's direction of motion, and therefore cannot be used to increase the speed of a particle. (C) Magnetic forces are too weak to significantly affect the motion of a charged particle. (D) Magnetic forces are so strong that they would accelerate the particles to dangerous speeds.
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Answer 1

The voltage across a circuit is remain constant only the voltage across resistor is changes by adding resistors so The voltage across a circuit is neither increased nor decreased by adding resistor to circuit Therefore correct option is (D) \r\n since, in parallel combination of resistor voltage across resistor is remain same So, baring out bulb is not effect another bulb�s voltage Therefore, correct option is (B) A circuit breaker prevents the circuit from a dangerous increase in current by melted down \r\n Every Magnet is behave like a separate magnet after each time it is broken So, each resulting piece is a magnet with one north pole and one south pole Therefore, correct option is (C)
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