8) Three identical point charges (Q=+3uC) are arranged in an equilateral triangle as shown. What is the magnitude and direction of the net electric force on the charge at the origin? a) 8N at 30 degrees b) 14N at 30 degrees 0.lm. a) 20 b) 8N at 210 degrees d) 14N at 210 degrees 9) How many electrons are moving through a current of 2A for 2 s? a) 3.2 x 10-¹⁹ b) 6.28 x 10 18 c) 4 d) 2.5 x 10 19 X 10) How much electrical energy is generated by 100 W light bulb turned on for five minutes? b) 500 c)3000 d) 15,000 e) 30,000

A particle with mass m and charge –q is suspended when the electrical force field E balances the gravitational force field g. m × g = q × E. Under the same conditions, in which direction does a particle with mass 2m and charge –q move? up, neither, down

If a proton at a particular distance from a charged particle is attracted with a given force, what happens to that force if the distance is doubled?. Explain using equations.

A satellite in orbit around Earth is exposed to radiation from the Sun. This radiation may cause the satellite to become positively charged. Some Wavelengths Incident on a Satellite I 2.25 x 10-7 m II 2.33 x 10-7 m III 3.24 x 10-7 m IV 4.28 x 10-7 m Platinum is commonly used to coat satellites and has a work function of 8.5 x 10-19 J. Which of the following wavelengths listed above would cause a satellite with a platinum coating to become positively charged? Wavelength I only Wavelength IV only Wavelengths I and II Wavelengths III and IV