Physics

An oil droplet with a mass of 3.50 x 10^-15 kg accelerates downward at a rate of 2.50 m/s2 when it is between two horizontal charged plates that are 1.00 cm apart. Assuming that the excess charge on the droplet is negative and the top plate is positive, how many excess electrons does the droplet carry if the potential difference between the plates is 533 V?

Is this the equation I should be using..?

E = v/d

q E = m g

If I use the above eqs. I get the wrong answer =(

Plz help!! and thank you in advance! =)

  1. 👍 0
  2. 👎 0
  3. 👁 215
asked by Marium
  1. qE = mg only if the droplet is stationary. Use the acceleration rate (a) to get

    qE -mg = ma

    You should be able to solve for q.

    You do have the correct formula for E

    1. 👍 0
    2. 👎 0
    posted by drwls
  2. I just figured that out but thank you very much! :)

    1. 👍 0
    2. 👎 0
    posted by Marium

Respond to this Question

First Name

Your Response

Similar Questions

  1. Physics

    A 0.7 um-diameter droplet of oil, having a charge of +e, is suspended in midair between two horizontal plates of a parallel-plate capacitor. The upward electric force on the droplet is exactly balanced by the downward force of

    asked by Lauren on February 6, 2011
  2. Physics help!

    The earth has an electric field of about 150 N/c pointed downward. A 1.00 (micrometer) radius of water droplet is suspended in a calm air. Find the 1) mass of the water droplet 2) charge on the water droplet 3) number of access

    asked by Happiness delight on August 14, 2017
  3. PHYSICS

    In the early 1900s, Robert Millikan used small charged droplets of oil, suspended in an electric field, to make the first quantitative measurements of the electron’s charge. A 0.67-um-diameter droplet of oil, having a charge of

    asked by JOTHEY on March 6, 2010
  4. AP Physics

    You can obtain a rough estimate of the size of a molecule by the following simple experiment. Let a droplet of oil spread out on a smooth water surface. The resulting oil slick will be approximately one molecule thick. Given an

    asked by Brittany on September 4, 2013
  5. physics

    A small droplet of oil with mass of 1.84×10-15 kg is held suspended in a region of uniform electric field directed upward with a magnitude of 6625 N/C. Is the excess charge on the droplet positive or negative? NEGATIVE b.How many

    asked by TP on September 1, 2011
  6. University physics

    "A droplet of oil carries an extra charge of one electron and is held motionless between parallel plates separated by 1.80 cm across which there is a potential difference of 55.5 kV. What is the mass of the droplet?" I assumed

    asked by Ed on February 10, 2016
  7. Chemistry

    (a) What is the diameter, in micrometers, of a spherical ink droplet from an early version of an ink-jet printer if the volume of the droplet is 200 ± 10 pL? If the ink has a density of 1.1 g/mL, what is the mass in milligrams of

    asked by Zandria on May 25, 2009
  8. physics

    You measure your weight by stepping on a spring scale inside an elevator. If elevator accelerates either upward or downward, the spring scale gives a reading different from your weight. a) Calculate how much a 70 kg person weigh

    asked by michael on February 11, 2012
  9. physics

    In the Millikan oil drop experiment, an atomizer (a sprayer with a fine nozzle) is used to introduce many tiny droplets of oil between two oppositely charged parallel metal plates. Some of the droplets pick up one or more excess

    asked by James on January 24, 2010
  10. Science

    James drops a marble. It accelerates downward at a rate of mc005-1.jpg. After 3.00 s, how fast is the marble moving downward?

    asked by Hanny on May 2, 2016

More Similar Questions