Which of the following statements about magnetic fields is not true? I Magnetic Flux is a vector. I Changing magnetic fields create electric fields. I Changing electric fields create magnetic fields. I The magnetic field cannot do work on a moving charge. I force on a moving charge can be zero. I I The magnetic 2. If you double the current through an inductor, the energy stored in the associated magnetic field increases by a factor of I three I I four I eight I I sixteen I I Two- wrong I 3.
If the North Pole off magnet is approaching a loop of wire, the loop of wire will rate a magnetic field that I repels the bar magnet I I attracts the bar magnet – wrong I I causes the bar magnet to explode. I I converts the bar magnet into a black hole. I I None of the above I 4. Which of the following statements about Electric Guitars is not true? I Electric Guitars utilize Friday’s Law. I I Electric Guitars utilize Lens’s Law. – wrong I I The pickup coils in an Electric Guitar are inductors. I I Jim Hendrix used an electric guitar when he recorded the album Electric Lady Land released in 1968. I The pickup coils used in an Electric Guitar store current. I 5. If the current through a solenoid is increasing, there is a voltage drop across the solenoid in the direction of the current. I True I I False I 6. Which of the following types of light has the longest wavelength? I Infrared. I I Blue. I I iv. I I Gamma Rays. I 7. Which of the following statements about light is true? I Light waves carry energy. I I Light is electromagnetic radiation. I High frequency light has more energy than low frequency light. I I Red. I Blue light I All of the above are true.
I I When the magnetic moment of the current loop is parallel to the field. I When 17. Suppose a current I is coming straight at you. What is the direction of the magnetic field according to you? I Clockwise. I I Counterclockwise. I I Straight towards you. I I Straight away from you. I 18. How do we define the direction of magnetic flux ATA point in space? I It is the direction that the North Pole of a compass need points at that location. I the direction that the South Pole of a compass need points at that location. There is no direction for magnetic flux, it is not a vector.
I 19. When is the magnetic force on a moving charge always equal to zero? The magnetic field is non-uniform. I I When the charge is moving perpendicular to the field. I I When the charge is moving parallel to the field. I I When the magnetic field is increasing with time. I I Never. There is always a magnetic force exerted on a moving charge. I 20. A long, straight wire carries a current of AAA to the right. Another long, straight wire carries a current of IOWA to the left as shown. In which of the regions, l, II or Ill, I None of them – wrong I