True or False. Use A to the statement for True and B for False. Place your answe

Question

True or False. Use A to the statement for True and B for False. Place your answer on the line next to the statement. Moving a coil of wire towards a magnet will not create an emf in the coil if the magnetic field is perpendicular to the normal of the coil. An electromagnetic wave is an example of a longitudinal wave. A polarizer only lets the part of the electric feld that is perpendicular to the transmission axis pass through. A concave mirror only forms real images The current in the secondary coils of a step-up transformer is larger than the current in the primary coils. Matching. Place the letter of the correct answer next to the statement. Each choice will be used only once. A direct current B. Alternating current C.magnetic field D. magnetic flux E induced emf F. induced current G. Lenz's Law H Step-up I. Step-down J. Electric field K. speed of light L. Magnetic field M. frequency N. wavelength O. energy density P. intensity Q. unpolarized R. polarized S. polar

Explanation / Answer

(B) (9) True, moving a coil towards a magnet, when magnetic field is always perdendicular to the normal of the coil, there will be no emf induced in the coil. The reason is, as normal makes an angle 90 degree with magnetic field, no magnetic flux passes through the coil and for any movement flux is always zero, or constant. Hence as rate of change of flux is zero, no emf will be produced.

(10)False, an electromagnetic wave is an example of a transversal wave as the direction of the oscillating electric and magnetic fields is perpendicular to the direction of motion of wave, hence it is a transversal wave.

(11)False, polariser transmition axis is like a slit, which allows those components, which are parallel to the slit. Hence, the polarizer allows those components of electric field which are parallel to it, not perpendicular.

(12)False, when the object is at a distance which is less than the focal distance of the concave mirror, ot forms the virtual and enlarged image on the opposite side of the mirror.

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