Which of the following will change the magnetic flux in a coil? A) increasing th

Question

Which of the following will change the magnetic flux in a coil? A) increasing the magnetic field B) decreasing the area of the coil C) spinning the coil D) all of these. Which of the following scientists discovered electromagnetic induction. A) Faraday B) Henry C) Both of them D) Neither of them An electromagnetic wave is a A) transverse wave because the electric field is parallel to the wave motion. B) transverse wave because the magnetic field is parallel to the wave motion. C) transverse wave because both the magnetic and electric fields are perpendicular to the wave motion. D) none of these. Light is polarized in the vertical direction and is incident upon an ideal polarizer with its transmission axis oriented horizontally. Which of the following is true the intensity of the light after passing through the polarizer? A) one-half the incident intensity. B) the same as the incident intensity. C) one-fourth the incident intensity. D) zero.. Which of the following is an image formed by a convex mirror? A) Real, upright, reduced image B) Real, inverted, enlarged image. C) Virtual, inverted, enlarged image D) Virtual, upright, reduced image The energy density of the electromagnetic wave is A) greater in the electric field B) greater in the magnetic field. C) equal in both the electric and magnetic fields. D) there is no energy. Which of the following will induce the largest emf in a coil of wire? A) increasing the magnetic field and increasing the area of the coil B) increasing the magnetic field and decreasing the area of the coil C) decreasing the magnetic field and increasing the area of the coil D) decreasing the magnetic field and increasing the number of turns in the coil. A ray of light is incident upon a concave mirror at 35 degree from the normal. The reflected angle is A) 35 degree from the normal because the two angles are always equal for reflection. B) greater than 35 degree from the normal because the surface is curved inward. C) less than 35 degree from the normal because the surface is curved inward. D) Cannot be determined from the given information.

Explanation / Answer

1)(D) All of these

The magnetic flux is given by:

phi = B A

Increase in B will change the flux, decreasing area will also change the flux. And spinning will lead to change in Area so teh flux will change in all three cases hence, (D) all of these is the correct choice.

2)(A)Faraday

Micheal Faraday discovered electromagnetic induction, which states that the change of magnetic flux induces an emf which apposes the cause due to which it is produced.

3)(C)

In an electromagnetic wave both electric and magnetic fields are perpendicular to each other and the direction of propagation.

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