Suppose you want to produce a strong magnetic field that is constant in magnitud

Question

Suppose you want to produce a strong magnetic field that is constant in magnitude and direction in a region of space. Which one of the following would you choose to produce this field? a) The region surrounding a loop of a current-carrying wire b) The interior region of a long current carrying solenoid. c)The region surrounding a long, straight, current-carrying wire A charged particle is moving in a uniform, constant magnetic field. Which one of the following statements concerning the magnetic force exerted on the particle is false a) The magnetic force does not change the kinetic energy of the particle b) The magnetic force increases the speed of the particle c The magnetic force does no work on the particle. A long, straight wire carries a current I. If the magnetic field at a distance d from the wire has magnitude B, what is the magnitude of the magnetic field at a distance 2d from the wire? a) 8B b) B/2 c) B/4 Kirchoff's laws are used in order to simplify complex circuits. Which of the following statements is incorrect? a) The sum of the currents entering any junction in a circuit must be less than the sum of the currents leaving that junction b) The sum of the currents entering any junction in a circuit must equal the sum of the currents leaving that junction c) The sum of the potential differences across all the elements around any closed circuit loop must be zero An electric dipole is placed in a uniform external electric field: a) The net electrostatic force on the dipole is positive b) The net electrostatic force on the dipole is zero c) The net electrostatic force on the dipole is negative 11) The equation below states that (note: A represents area a) A magnetic monopole cannot be supported b) A magnetic field is always present c) Magnetic field is always zero d) None of the above

Explanation / Answer

6) b) the interior region of a long current carrying solenoid

7) c) the magnetic force increases the speed of the particle.

8) b) B/2

9) a) the sum of current entering any junction in a circuit must be less than the sum of the current leaving that junction

10) b) the net electrostatic force on the dipole is zero

11) a) A magnetic monopole cannot be supported

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