In order to get a magnified image of an object, it's distance from a converging lens should be
A. A converging lens can't produce a magnified image
B. At the focal length
C. Smaller than the focal length
D. There is not enough information here to answer the question.
Answer: B. At the focal length
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In using a magnet to find north, the term "declination" represents
A) the degree of weakness of the magnetic field. B) the angle above the horizontal of the earth's magnetic field. C) another term for "angle of dip." D) the angle below the horizontal of the earth's magnetic field. E) not given
An ideal step-down transformer has 200 primary turns and 50 secondary turns. If 440 volts (rms) is placed across the primary, what is the current in the secondary when the load resistance is 7.00 ohms?
a. 3.6 A (rms) b. 7.3 A (rms) c. 11.4 A (rms) d. 15.7 A (rms) e. 12.4 A (rms)
A galvanometer has an internal resistance of 100 ? and deflects full-scale at 2.00 mA. What size resistor should be added to it to convert it to a millivoltmeter capable of reading up to 400 mV?
A) 50.0 ? in series B) 50.0 ? in parallel C) 75.0 ? in parallel D) 100 ? in series E) 100 ? in parallel
A circuit consists of N resistors, all of resistance R, connected as shown below. A potential difference V is applied to the circuit. The equivalent resistance of the circuit is
A.
.B.
C.
.D.
E.