Posted by **Nathaniel** on Monday, June 12, 2006 at 3:26pm.

An electrostatic force of 5 N exists between two identical point charges, each of mass 0.01 g, placed 4 mm apart.

a.) Find the magnitude of each charge.

b.) One of these charges is placed into a magnetic field. Assuming that the charge has a speed of 50 m/s and travels a circular path of radius 5 mm, what is the strength of the magnetic field?

c.) Now the charge is removed and a 0.5 m long wire is placed into the magnetic field from part b. What magnitude current would have to pass through the wire in order for it to feel the same magnetic force as the charges in part a?

(a) Use the Coulomb force formula for the force acting on each of two charges.

F = k Q1 Q2/R^2

In your case Q1 = Q2 = Q, and R = 0.004 m. Look up k is you don't kow what it is. Solve for Q.

The mass won't matter in the answer to (a).

(b) This time the mass matters. Set the centripetal force m V^2/R equal to the magnetic force q V B. Thet is what keeps the particle moving in a circle.

Solve for the megnetic field B, in units of Tesla. Make sure R = 0.005 m this time.

(c)Force on a wide of length L, carrying a current I perpendicular to a field B is

F = B I L. Set this equal to the 5 N force of part (a). Solve for I

## Answer this Question

## Related Questions

- Physics - A)When point charges q1 = +1.5 ìC and q2 = +5.7 ìC are brought near ...
- physics - Two spheres with charges of 4.00nC and 3.00nC are placed 0.500m apart...
- Physics - 1) if a positive and negative charge each has a magnitude of 6 uC and ...
- Physics - Two identical charges are 36 mm apart. The electrostatic force between...
- Physics - Two point charges are 10.0 cm apart and have charges of 2.0 μC ...
- Physics - 1.There are four charges, each with a magnitude of 2.5 µC. Two are ...
- ICS - I need help solving this question. "Two charges are 10 meters apart. The ...
- physics 2 - Two identical positive charges are placed 15 cm apart and the ...
- physics - Please Help, Two point charges are fixed on the y axis: a negative ...
- Physics - Two point charges are fixed on the y axis: a negative point charge q1...