Sample Test II: This Sample is roughly the same difficulty and length as the actual test will be.
1. A circular loop of wire is rotating in a uniform magnetic field. If its diameter is doubled what is the effect on the induced emf if everything else stays unchanged?
2. An AC transformer has 500 turns in the primary coil and 2000 turns in the secondary coil wound on the same soft iron core. with 120 V and 0.5 A into the primary, what voltage and current is output from the secondary coil?
3. List two different types of sources for a magnetic field.
4. A solenoid has 500 turns of wire and is 10 cm long. How much current is required to produce a magnetic field of 27 mT at its center ?
5. A converging lens with a 5 cm focal length is used as a magnifying glass. How far from an object should it be placed to produce a virtual image at infinity ?
6. A uniform magnetic field of 0.5 T is directed into the page. If a proton is moving to the right with a velocity of 104 m/s what is the force acting on it ? (2nd Q: what path will it take ?)
7. Light of 640 nm wavelength is normally incident in a double slit experiment. If the second order minimum is 15.0 cm from the center on a screen that is placed 2.0 m from the slits, what is the slit separation distance? 8. What is the velocity of light in water (index of refraction, 1.33) ?
9. A diverging (convex) mirror has a radius of curvature of 40 cm. Where will the image be for an object that is 12 cm from this mirror ? Is the image real or virtual ? upright or inverted ? 10. Describe the relationship between the electric fields, magnetic fields, ands propagation direction for an electromagnetic wave (a diagram will work). List two examples of E&M waves.
I. An object that is 5.0 cm tall is placed 40 cm from a converging lens that has a focal length of 25 cm.
a) Draw a proper ray tracing diagram that shows the image formation with at least two rays
that follow the standard rules.
b) Determine the position of the image (image distance).
c) What is the size and orientation of the image.
II. A metal bar of length 12 cm is pulled at constant velocity through a region of uniform magnetic field. Assume the field of 3.0 mT is directed into the paper and the bar moves at a constant velocity of 10 m/s to the right and its long axis perpendicular to both the field and velocity.
a) What (average) force will act on each “free” electron in the metal bar ?
b) What electric field in induced in this bar ?
c) What electrical potential difference would be measured between the ends of this bar as a result of the induced emf ?