28/03/2020 Magnetic Fields(Senior Class Physics Study by Topics) 28/03/2020 0Comments by Gate Academy Welcome to your Magnetic Fields(Senior Class Physics Study by Topics) NAME EMAIL PHONE NUMBER 1. Field lines move from ____ South to north North to south West to east East to west 2. Which of the following statements about the orientation and effects of Earth's magnetic field is not true? A compass needle that can rotate both perpendicularly and parallel to the surface of Earth, points down at the magnetic south pole. The geographic North Pole of Earth is near the magnetic south pole. A compass needle always indicates the direction of true north. The geographic South Pole of Earth corresponds to the magnetic north pole. 3. What describes ΦM? ABcosθ The number of field lines that cross a certain area Magnetic flux All of the above 4. What is the process by which escapes convection currents from the earth's core called? Microteslas Paleomagnetism Magnetosphere Geodynamo 5. According to Flemming’s left hand rule, the thumb denotes? Direction of force Direction of force as well as current Direction of current Direction of magnetic field 6. According to Flemming’s left hand rule, the middle finger denotes? Direction of current Direction of magnetic field Direction of force as well as current Direction of force 7. The relation between the direction of current and the direction of magnetic field is ________ Perpendicular Same direction Opposite direction Unrelated 8. What is an magnetosphere? Its a belt 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. Who cares? 9. A charged particle moves with velocity v in a magnetic field B. The magnetic force on the particle is a maximum when v is zero False True 10. If the flow of electric current is parallel to the magnetic field, the force will be _____ Infinity Half the original value Maximum Zero 11. Magnetic fields move in a _____ path. straight zig-zag bent Circular 12. Magnetic field lines ___________ at the north pole. Neither emerge nor converge Either emerge or converge Converge Emerge 13. Since more magnetic field lines cross the area that is near the pole of a magnet, what does this indicate about the magnetic field strength in that location? It is weaker. It is stronger. It is leaving the magnet. It is entering the magnet. 14. Which of the following is used to determine the direction of magnetic field in a current carrying conductor? Left hand palm rule Left hand thumb rule Right hand thumb rule Right hand palm rule 15. 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 Upward out of the page Toward the bottom of the page Toward the top of the page Toward the left edge of the page 16. There are three different pole True False 17. Electric currents are measured in...? Amperes Nanoteslas Newtons Microteslas 18. The Earth Magnetic Field contains: Its magnetic is shaped like a bar All of the above Liquid iron 2 poles 19. How is the intensity of the earth's magnetic field measured? Gauss Ampere Tesla Newton 20. Weakest force in nature is? Magnetic force Weak force Gravitational force Electric force 21. What causes magnetism? Earth's atmosphere Gravity Friction Charged electric particles 22. What happens when two north poles of magnets are placed together? They cancel each other out. They attract. The strength of the magnet is doubled. They repel. 23. The relation between the direction of force and the direction of magnetic field is ________ Perpendicular Opposite direction Same direction Unrelated 24. Which of the following statements correctly describes the behavior of magnets? Like poles attract each other, and unlike poles repel each other. Like poles repel each other, and unlike poles attract each other. None of the above. Both like and unlike poles can attract and repel each other depending on the surrounding materials. 25. What part of the earth is under the influence of the magnetic field ? Biosphere Lithosphere Hydrosphere Magnetosphere 1 out of 25 Time is Up! Time's up
