5. Circle the correct statement. Each correct answer is worth 5 points, no partial credit. No credit for multiple circles on the same question.
NAME :
a) A convergent lens with a very small focal length is placed in contact (no gap) with a very large focal length convergent lens. The combined focal length is,
(i) much larger than either
(ii) approximately equal to the smaller.
(iii) approximately equal to the larger.
(iv) none of these.
b) An infinitely long wire and a single loop are on top of a table. The plane of the loop is parallel to the plane of the table. The loop is moving with constant speed v parallel to the wire.
(i) there will be no induced current in the loop.
(ii) as seen from above, the induced current is running clockwise.
(iii) as seen from above, the induced current is running counterclockwise.
(iv) none of the above, we need to know the direction of the current in the wire.
c) An electron moving in the positive y direction, at right angles to a magnetic field, experiences a magnetic force in the negative x direction. What is the direction of the magnetic field?
(i) It is in the negative x direction.
(ii) It is in the positive y direction.
(iii) It is in the negative z direction.
(iv) It is in the positive z direction.
d) At a quiet pond with crystal clear water, you decide to fish with bow and arrow. When you aim at the fish you see, you must aim
(i) closer to the surface then you perceive the fish to be.
(ii) directly at the fish.
(iii) deeper then you perceive the fish to be.
(iv) It depends on how deep the pond is.
e) For a right handed xyz coordinate system, if the E-vector is in the +z direction, and the B-vector is in the +x direction, what is the direction of propagation of the electromagnetic waves?
(i) +x
(ii) -x
(iii) +y
(iv) +z
f) Which of the following sets of characteristics describes the image formed by a plane mirror?
(i) real and inverted.
(ii) real and upright.
(iii) virtual and upright.
(iv) virtual and inverted.