For problems 7-9 please refer to the following light-bulb circuit. The wattage r
ID: 1617718 • Letter: F
Question
For problems 7-9 please refer to the following light-bulb circuit. The wattage rating assumes a 12V source. The bulb brightness increases with increasing current. The light bulb power rating (12V) is a. 4W b. 12 W c. 18 W d. 24 W The equivalent resistance of the light bulb circuit is a. 32 Omega b. 24 Omega c. 12 Omega d. 10 Omega e. 7.5 Omega Rank the light bulbs in terms of their brightness. a. B_1 = B_2 = B_1 = B_4 b. B_1 > B_2 > B_3 > B_4 c. B_1 > B_4 > B_1 = B_2 d. B_4 > B_1 > B_2 = B_3 c. B_4 > B_3 = B_2 > B_1 In the figure on the right, the magnetic field is coming out of the page and magnitude is decreasing. In which direction does the induced current in the wire loop flow? a. clockwise b. counterclockwise c. the current oscillates d. no current flows c. cannot tell from the given information The focal lengths of a telescope's objective and eyepiece lenses are 50 cm and 2 cm respectively. The telescope forms an image with angular magnification of a. 12.5 b. 25.0 c. 50.0 d. 100. e. 200Explanation / Answer
Q.8 Equivalent Resistance= ( 12 x 6 )/ ( 12 + 6 ) + 6= 10 ohms
Q.9 B1 > B4 > B2 = B3
Q. 10 counterclock wise ( as per Lenz' law )
Q. 11 M = fo/ fe = 50./2 = 25
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