What happens when a charged insulator is placed near an uncharged metallic object?
1.They repel each other.
2.They attract each other.
3.They may attract or repel each other, depending on whether the charge on the insulator is positive or negative.
4.They exert no electrostatic force on each other.
5.The charged insulator always spontaneously discharges.
2
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In polymer blends, the enthalpy of interaction is determined from the experimentally determined _____________parameter.
Fill in the blank(s) with the appropriate word(s).
When the number of turns in a solenoid and its length are both doubled, the ratio of the magnitude of the new magnetic field inside to the magnitude of the original magnetic field inside is what?
a. 0.25 b. 0.50 c. 1 d. 2 e. 4
In a 2-dimensional Cartesian coordinate system the y component of a given vector is equal to that vector's magnitude multiplied by which trigonometric function, with respect to the angle between vector and x axis?
a. sine c. tangent b. cosine d. cotangent
The bulk density of the Moon is ________ than that of the Earth it orbits
Fill in the blank(s) with correct word