Magnetic Flux and Induced EMF
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Questions and Answers

What is the unit for magnetic flux equivalent to?

  • 1 T-m²
  • 1 m/T
  • 1 T/s
  • 1 T-m (correct)

    • What is the relationship between induced emf and rate of change of magnetic flux according to Faraday's law?

  • Inversely proportional
  • Independent of the rate
  • Directly proportional (correct)
  • Proportional to the square of the rate

    • What factors affect the emf induced in a coil when a magnet moves inside it?

  • Number of turns in the coil, speed of the magnet, and strength of the magnet (correct)
  • Strength of the magnet and number of turns in the coil
  • Only the strength of the magnet
  • Speed of the magnet and strength of the magnet

    • What is associated with a time-dependent magnetic field?

    <p>Electric field</p> Signup and view all the answers

    What is the direction of the induced current in a square loop of wire when a decreasing magnetic field is directed into the page?

    <p>Counterclockwise</p> Signup and view all the answers

    What is the direction of current in a rectangular conducting loop when a long straight wire with a constant current is moved towards it?

    <p>Counterclockwise</p> Signup and view all the answers

    What is the main difference between radio waves and visible light?

    <p>Radio waves have a lower frequency</p> Signup and view all the answers

    What happens when an accelerating charge is produced?

    <p>Electromagnetic waves are produced</p> Signup and view all the answers

    What is the speed of light in a vacuum?

    <p>3x10^8 m/s</p> Signup and view all the answers

    What is the reason for the separation of colors from a white light incident to a prism?

    <p>Due to varying indices of refraction with wavelength</p> Signup and view all the answers

    What is NOT true for electromagnetic waves?

    <p>They travel at different speeds in vacuum, depending on their frequency</p> Signup and view all the answers

    What is the index of refraction defined as?

    <p>The speed of light in a substance divided by the speed of light in vacuum</p> Signup and view all the answers

    What type of image is formed when an object is placed in front of a thin lens?

    <p>Real, inverted, and same size</p> Signup and view all the answers

    An object of 3-cm height is placed in front of a thin lens, producing an image height of 6 cm. If the object distance is 4 cm, where is the image located?

    <p>-18 cm</p> Signup and view all the answers

    What happens to the beam emerging from the diverging lens when it is moved towards the converging lens?

    <p>It becomes diverging</p> Signup and view all the answers

    What is a fundamental principle followed by light waves?

    <p>The principle of superposition</p> Signup and view all the answers

    What is the purpose of the two slits in Young's experiment?

    <p>To create a path length difference between the light from the slits</p> Signup and view all the answers

    What is the condition for two light waves to be coherent?

    <p>Their frequencies are the same</p> Signup and view all the answers

    At what distance in front of a concave mirror must an object be held so that the image and the object are the same size?

    <p>Focal length</p> Signup and view all the answers

    What is the distance of the object from a concave mirror if the radius of curvature is 27 cm and the image produced is twice the size of the object?

    <p>20 cm</p> Signup and view all the answers

    What can be said about the image produced by an erect object outside the focal point of a converging lens?

    <p>It is inverted and real</p> Signup and view all the answers

    What type of lens is used to correct nearsightedness?

    <p>Diverging lenses</p> Signup and view all the answers

    What type of image is produced by a magnifying glass in front of an erect object?

    <p>Virtual and erect</p> Signup and view all the answers

    What can be said about the image formed by an object 30 cm away from the front of a converging lens with a focal length of 10 cm?

    <p>Real and larger than the object</p> Signup and view all the answers

    Which parameters should be decreased to produce more bending in a single-slit diffraction pattern?

    <p>Frequency and water depth</p> Signup and view all the answers

    What happens to the diffraction pattern and intensity at the center when the slit width decreases without other changes?

    <p>The pattern expands and the intensity decreases.</p> Signup and view all the answers

    What is the formula for the total number of slits in a diffraction grating?

    <p>$\frac{W}{2\lambda}(\sin\theta)$</p> Signup and view all the answers

    What is the diffraction angle for the second order line if the first order line is at a diffraction angle of 25°?

    <p>54°</p> Signup and view all the answers

    What is the effect of decreasing the slit width on the diffraction pattern?

    <p>The pattern expands and the intensity decreases.</p> Signup and view all the answers

    What are the parameters considered to produce a single-slit diffraction pattern in a ripple tank model experiment?

    <p>Wavelength, water depth, and slit width</p> Signup and view all the answers

    Study Notes

    Electromagnetic Induction

    • 1 weber, the unit for magnetic flux, is the same as 1 T-m².
    • Faraday's law states that an induced emf is directly proportional to the rate of change of the magnetic flux.
    • If the magnetic flux through a certain region is varying with time, an emf must exist parallel to the flux in the region.
    • The emf induced in a coil is affected by the strength of the magnet, number of turns in the coil, and speed at which the magnet moves.

    Magnetic Fields and Electric Fields

    • An electric field is associated with a time-dependent magnetic field.
    • A permanent magnet moving towards a loop of conducting wire can induce a current in the loop.

    Light and Electromagnetic Waves

    • Radio waves have a lower frequency than visible light.
    • Ultraviolet light has a shorter wavelength than infrared.
    • An accelerating charge produces electromagnetic waves.
    • The speed of light in vacuum is approximately 3 x 10⁸ m/s.
    • Electromagnetic waves consist of changing electric and magnetic fields, transport energy and momentum, and can be reflected.

    Refraction and Index of Refraction

    • The unit of index of refraction is not radian.
    • Light travels at different speeds in vacuum, depending on the substance it passes through.
    • When light travels from air to glass, it is refracted towards the normal and slows down.
    • The separation of colors from a white light incident on a prism is due to varying indices of refraction with wavelength.

    Lenses and Mirrors

    • The image formed by a thin lens can be real, inverted, and magnified.
    • The speed of light in vacuum divided by the speed of light in a substance is the index of refraction.
    • A converging lens can produce a real, inverted, and magnified image.

    Interference and Superposition

    • Light waves follow the principle of superposition.
    • Interference of light is evidence of the wave properties of light.
    • The two slits in Young's experiment create a path length difference between the light from the slits.
    • Coherent light waves have the same frequency.

    Diffraction

    • Diffraction image depends on the distance between the obstacle and the observation screen.
    • Decreasing the slit width in a single-slit diffraction pattern produces more bending.
    • A diffraction grating can produce a deviation in the deflected beam for a certain wavelength of light.

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    Test your understanding of magnetic flux, induced emf, and Faraday's law. Practice problems and concepts related to electromagnetism and physics.

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