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a long straight current-carrying wire carries a current from west to east a compass is held above the wirea which direction does the north pole of
q jingdan turned a screwdriver into a magnet by rubbing it with a strong bar magnet to pick up a screw that has fallen into an inaccessible spothow
the magnetic field of earth resembles the field of a bar magnet the north pole of a compass needle used for navigation generally points toward the
a holiday light string of ten bulbs is equipped with shunts that short out the bulbs when the voltage drop increases to line voltage which happens
a string of holiday lights has 25 identical bulbs linked in series every bulb dissipates 100 w when the string is linked to a 125-v outleta how much
the electric utility invoice for a household shows a usage of 1245 kwh during a certain 30-day periodwhat is the average power consumption during
by what factor would the i2r loss in transmission wires be reduced if the transmission voltage were boosted from 220 v to 22 kvsuppose that the rate
a manufacturer of light bulbs advertises that its 55-w bulb which produces 8000 lm of light output gives almost the similar light as a 600-w bulb
an electric motor with a load delivers 52 hp to its shaft 1 hp 746 w under these conditions it operates at 828 percent efficiency a how much current
the cold filament resistance of a light bulb is 200 the bulb consumes 75 w when it is operating from a 120-v sourceby what factor does the start-up
a charge of 200x 10-6 c is moved against a constant electric field if 450 x 10-4 j of work is done on the chargewhat is the potential difference
in a vacuum tube electrons accelerate from the cathode element to the plate element which is maintained at a positive potential with respect to the
suppose you have two parallel metal plates that have an electric field between them of strength 30 x 104 nc and are 0050 m apartconsider a point p
the electric field strength defined as a force per unit charge has the units newton per coulomb nc the formula for electric potential difference
a pith ball weighing 30 x 10-2n carries a charge of -10 x 10-6 c the pith ball is placed among two large parallel metal plates that are divided by
what are the magnitude and the sign of a point charge that experiences a force of 048 n east when placed in an electric field of 16 x 105 nc
a diffraction grating with slits separated by 340 x 10-6 m is illuminated by light with a wavelength of 589 nm the separation between lines in the
the width of the central bright band of a diffraction pattern is 29 cmlaser light of unknown wavelength passes through a single slit that is 0042 mm
red light lambda 685 nm falls on a slit that is 0025 mm wide the distance between the centers of the central bright band and the second-order
violet light lambda 415 nm falls on a slit that is 0040 mm wide the distance among the centers of the central bright band and the third-order dark
an oil film n 145 on the surface of a puddle of water on the street is 118 nm thickwhat frequency of light would be reflected 2d
a 957-nm film of an unknown substance is able to prevent 555-nm light from being reflected when surrounded by airwhat is the index of refraction of
light with a wavelength of 4545 nm passes by two slits that are 952 cm from a screen the distance among the centers of the central band and the
a physics student performs a double-slit diffraction experiment on an optical bench as shown in the figure below the light from a helium-neon laser
convex lens can be used as a magnifying glasswhen an object that is 150 cm from the lens has an image that is exactly 55 times the size of the object