Question

In: Physics

The electric field near the surface of Earth points downward and has a magnitude of 130...

The electric field near the surface of Earth points downward and has a magnitude of 130 N/C.

(a) Compare the upward electric force on an electron with the downward gravitational force.

____upward force/ downward force

(b) What magnitude charge should be placed on a penny of mass 6 g so that the electric force balances the weight of the penny near Earth's surface?

C

Solutions

Expert Solution

Force = field strength x charge on electron = 130 x e
Gravitational force = mg = electron mass x 9.81

Force/Gra. force = 130*e / me*9.81 = 130*1.6*10^-19 / 9.81*9.1*10^-31 = 208 / 89.3*10^-12

b) weight of penny = 0.006 x 9.81
Electric force = 130 x q

So q = (0.006 x 9.81)/130 = 4.527*10^-4 c

genius_generous answered 2 years ago
Next > < Previous

Related Solutions

The electric field near the surface of Earth points downward and has a magnitude of 130 N/C.
The electric field near the surface of Earth points downward and has a magnitude of 130 N/C. (a) Compare the upward electric force on an electron with the downward gravitational force. (b) What magnitude charge should be placed on a penny of mass 2 g so that the electric force balances the weight of the penny near Earth?s surface? C
The electric field near Earth's surface points downward and has a magnitude of approximately 104 N/C....
The electric field near Earth's surface points downward and has a magnitude of approximately 104 N/C. What is the force (Fe) on an electron due to this electric field? magnitude= ?? Find the ratio of the magnitude of this force to the magnitude of the gravitational force (Fg) on the electron.. Fe/ Fg=?
Near the surface of the Earth there is an electric field of about 150 V/m which...
Near the surface of the Earth there is an electric field of about 150 V/m which points downward. Two identical balls with mass 0.407kg are dropped from a height of 2.29m , but one of the balls is positively charged with q1 = 338?C , and the second is negatively charged with q2=-338?C . Use conservation of energy to determine the difference in the speeds of the two balls when they hit the ground. (Neglect air resistance.)
What is the magnitude and direction of an electric field if it exerts a downward force...
What is the magnitude and direction of an electric field if it exerts a downward force of 10-6N on a charge of -5μC? Could you please explain how to do this question? Thank you
A uniform electric field of magnitude 40 N/C is directed downward.
A uniform electric field of magnitude 40 N/C is directed downward. What are the magnitude and the direction of the force on a + 4C charge placed in this electric field? 160 N directed upward 160 N directed downward 10 N directed downward 0.1 N directed downward
At the equator, near the surface of the Earth, the magnetic field is approximately 50 ??...
At the equator, near the surface of the Earth, the magnetic field is approximately 50 ?? northward, and the electric field is about 100 N/C downward in fair weather. Find the magnitude and direction of gravitational, electric, and magnetic forces on an proton in this environment, assuming the proton has an instantaneous velocity of 5?106m/s directed to the west.
A magnetic field has a magnitude of 1.2e-3 T, and an electric field has a magnitude...
A magnetic field has a magnitude of 1.2e-3 T, and an electric field has a magnitude of 5.1e3 N/C. Both fields point in the same direction. A positive -1.8 microC moves at a speed of 3.5e6 m/s in a direction that is perpendicular to both fields. Determine the magnitude of the net force that acts on the charge.
On a clear day the electric field in the atmosphere near the earth's surface is 100...
On a clear day the electric field in the atmosphere near the earth's surface is 100 N/C, directed vertically downward. (a) If we adopt the convention that the potential at the earth's surface is 0, what is the potential 492 m above the surface? (b) What is the potential at the top of Pike's Peak, 14,110 ft above sea level? (Hint: Do not assume that the surface in part (a) is at sea level.) Explain.
What are the magnitude and direction of the electric field?
A small object of mass 3.96 g and charge -17.1 µC is suspended motionless above the ground when immersed in a uniform electric field perpendicular to the ground. What are the magnitude and direction of the electric field?What is the magnitude _________ N/CWhat is the direction (upward East West downward)
A uniform magnetic field points upward, parallel to the page, and has a magnitude of 7.85...
A uniform magnetic field points upward, parallel to the page, and has a magnitude of 7.85 mT. A negatively charged particle (q = -3.32 µC, m = 2.05 pg) moves through this field with a speed of 67.3 km/s at a 42° with respect to the magnetic field, parallel to the page as shown. What is the magnitude of the magnetic force on this particle? 1.75 mN 1.30 mN 1.61 mN 1.17 mN
ADVERTISEMENT
Subjects
ADVERTISEMENT
Latest Questions
ADVERTISEMENT