28/03/2020 Magnetic Fields(Senior Class Physics Study by Topics) 28/03/2020 53Comments by Gate Academy Welcome to your Magnetic Fields(Senior Class Physics Study by Topics) NAME EMAIL PHONE NUMBER 1. What describes ΦM? Magnetic flux The number of field lines that cross a certain area ABcosθ All of the above 2. Where are the two poles located at? Canadic Ocean & Off the cost of the Antarctica Asia & Russia None of the above 3. Field lines move from ____ East to west South to north West to east North to south 4. Which of the following statements about magnetic fields is not true? Magnetic field strength increases as the distance from the magnetic source increases. Magnetic fields have both magnitude and direction. Magnetic fields are regions in which magnetic forces can be detected. Magnetic fields are vector quantities. 5. How is the direction of a magnetic field, B, defined at any location? The direction that is perpendicular to Earth’s magnetic field The direction toward which the south pole of a compass needle points The direction toward which the north pole of a compass needle points The direction that is parallel to the imaginary magnetic field lines 6. Which of these is most likely to attract? North poles Unlike poles Like poles South poles 7. The ratio of magnetic force to electric force on a charged particle getting undeflected in a field is? 1 0 4 2 8. Where is the point where the magnetic field is vertical? Global pole South pole North pole Local pole 9. What part of the earth is under the influence of the magnetic field ? Lithosphere Biosphere Magnetosphere Hydrosphere 10. What causes magnetism? Gravity Earth's atmosphere Friction Charged electric particles 11. Which of the following statements about the orientation and effects of Earth's magnetic field is not true? The geographic North Pole of Earth is near the magnetic south pole. A compass needle always indicates the direction of true north. A compass needle that can rotate both perpendicularly and parallel to the surface of Earth, points down at the magnetic south pole. The geographic South Pole of Earth corresponds to the magnetic north pole. 12. Magnetic field lines ___________ at the north pole. Either emerge or converge Neither emerge nor converge Converge Emerge 13. Which of these is most likely to repel? Unlike poles Like poles South poles North poles 14. What is our best evidence that Earth has a magnetic field? Winds blow from east to west. All things fall toward Earth's center. Earth's oceans all have currents A compass needle lines up with it. 15. Which of the following statements about magnetic field lines is not true? Magnetic field lines have no beginning or end. Magnetic field lines form open or closed loops. Magnetic field lines appear to begin at the north pole of a magnet. Magnetic field lines appear to end at the south pole of a magnet. 16. An electron moves in the plane of this paper toward the top of the page. A magnetic field is also in the plane of the page and directed toward the right. The direction of the magnetic force on the electron is Toward the bottom of the page Toward the left edge of the page Toward the top of the page Upward out of the page 17. Which of the following is used to determine the direction of magnetic field in a current carrying conductor? Right hand thumb rule Left hand thumb rule Right hand palm rule Left hand palm rule 18. Magnetic Field lines move from ______ East to west West to east North to south South to north 19. According to Flemming’s left hand rule, the index finger denotes? Direction of current Direction of magnetic field Direction of force as well as current Direction of force 20. What is an magnetosphere? I dont know The outer region of the earth's ionosphere, where the earth's magnetic field controls the motion of charged particles, as in the Van Allen belts. Its a belt Who cares? 21. According to Flemming’s left hand rule, the middle finger denotes? Direction of force Direction of magnetic field Direction of current Direction of force as well as current 22. How is Earth’s magnetic field similar to that of a magnet? It is hundreds of miles long. It is shaped like a horseshoe. It is made in Earth's core. It has North and South Poles. 23. If the flow of electric current is parallel to the magnetic field, the force will be _____ Half the original value Zero Infinity Maximum 24. Which of these is not part of the magnetosphere? Magnetosheath Northern tail Eastern tail lobe Bow shock 25. The relation between the direction of force and the direction of magnetic field is ________ Same direction Opposite direction Unrelated Perpendicular 1 out of 25 Time is Up! Time's up
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