28/03/2020Magnetic Fields(Senior Class Physics Study by Topics) 0Comments by Gate Academy Welcome to your Magnetic Fields(Senior Class Physics Study by Topics) NAME EMAIL PHONE NUMBER 1. What is the strength of magnetic field known as ________ Density Magnetic flux density Flux Magnetic strength2. How is the intensity of the earth's magnetic field measured? Gauss Tesla Ampere Newton3. Where is the point where the magnetic field is vertical? North pole Global pole Local pole South pole4. What is our best evidence that Earth has a magnetic field? Winds blow from east to west. A compass needle lines up with it. All things fall toward Earth's center. Earth's oceans all have currents5. Can we see magnetic flux lines? Only when the field strength is very large Yes Depends on the strength of the field No6. The Earth Magnetic Field contains: All of the above Its magnetic is shaped like a bar Liquid iron 2 poles7. 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 stronger. It is weaker. It is entering the magnet. It is leaving the magnet.8. 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 palm rule Right hand thumb rule9. Lines signify the strength of magnetic fields. If the lines are denser the magnetic field is...? Normal Weaker Stronger Slower10. 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.11. Magnetic fields are made by...? Gravity Electric Currents Heat Friction12. What happens when two north poles of magnets are placed together? They repel. They cancel each other out. The strength of the magnet is doubled. They attract.13. How is the direction of a magnetic field, B, defined at any location? The direction that is parallel to the imaginary magnetic field lines 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 perpendicular to Earth’s magnetic field14. Weakest force in nature is? Electric force Weak force Magnetic force Gravitational force15. Where are the two poles located at? Canadic Ocean & Off the cost of the Antarctica None of the above Asia & Russia16. Electric currents are measured in...? Microteslas Nanoteslas Newtons Amperes17. What describes ΦM? ABcosθ Magnetic flux The number of field lines that cross a certain area All of the above18. The ratio of magnetic force to electric force on a charged particle getting undeflected in a field is? 0 2 1 419. What causes magnetism? Charged electric particles Friction Gravity Earth's atmosphere20. What is the process by which escapes convection currents from the earth's core called? Magnetosphere Paleomagnetism Microteslas Geodynamo21. When a charged particle moves at right angles to the magnetic field, the variable quantity is? Speed Energy Momentum22. Which of these is most likely to repel? Like poles Unlike poles North poles South poles23. Which of these is most likely to attract? Like poles Unlike poles South poles North poles24. Which of the following statements about the orientation and effects of Earth's magnetic field is not true? 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 North Pole of Earth is near the magnetic south pole. The geographic South Pole of Earth corresponds to the magnetic north pole.25. There are three different pole False True26 out of 25Time is Up!