UNIT B electrostatics, fields, & parallel plates Exit Slip

Which graph best represents the relationship between the strength of an electric field and distance from a point charge?

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An object with a net charge of 4.80 x 10^-6 coulomb experiences an electrostatic force having a magnitude of 6.00 x 10^-2 newton when placed near a negatively charged metal sphere. What is the electric field strength at this location?

• 2.88 x 10^-8 N/C directed toward the sphere

• 1.25 x 10⁴ N/C directed toward the sphere

• 2.88 x 10^-8 N/C directed away from the sphere

• 1.25 x 10⁴ N/C directed away from the sphere

If the force of attraction between two charges is 310 N, what will be the force if one of the charges is made four times larger and the distance is reduced to half of its original value? [record your answer to the nearest 10N ex: ____N]

Two parallel plates are 3.00 cm apart and there is an electric potential difference of 44.0 V between them. Express your answer for the electric field strength between the parallel plates expressed in scientific notation a.bc x10^d N/C; Where the values for a, b, c, and d are _ _ _ and _. [record only the 4 digits as your answer ]

Identical charges A, B, and C are located between two oppositely charged parallel plates, as shown in the diagram below. The magnitude of the force exerted on the charges by the electric field between the plates is

• least on A and greatest on C

• the same on A and C, but less on B

• the same for A, B, and C

• greatest on A and least on C

The diagram above shows a point, P, located midway between two oppositely charged parallel plates.

If an electron is introduced at point P, the electron will

• accelerate toward the negatively charged plate

• travel at constant speed toward the negatively charged plate

• travel at constant speed toward the positively charged plate

• accelerate toward the positively charged plate

A moving electron is deflected by two oppositely charged parallel plates, as shown in the diagram above.

The electric field between the plates is directed from

• C to D

• D to C

• A to B

• B to A

An oil drop of mass 6.6 × 10^–14 kg is suspended in an electric field of 2.0 × 10^6 N/C between horizontal plates that are 4.0 cm apart.

Calculate the magnitude of the charge on the oil drop suspended between the two parallel plates a.b x10^-19 C [record only the 2 significant digits from your answer a.b with the decimal ]

A gold-leaf electroscope with 1.25 x 10^10 excess electrons is grounded and discharges completely in 0.50 s. Calculate the average current through the grounding wire (check your orange book for a current equation). Match your answer in the format a.b x10^-9 A

• 2.0 x10^-9A
• 3.5 x10^-9A
• 4.0 x10^-9A