Three point charges are arranged a line. Charge q_3 = 5 nC and is at the origin

Question

Three point charges are arranged a line. Charge q_3 = 5 nC and is at the origin Charge q_1 = -8 nC and is at x =4.0 cm. Charge q_1 is at x = 2.0 cm. Find the charge q_1, (magnitude and sign) such that the net force on q_1 is zero? A tungsten rod is 50 cm long and has a square cross-sectional area with sides of 0.5 cm. What is the resistance of the rod? (Use rho = 5.5 times 10^-8 Ohm middot m). A 10 cm length of wire, carries a current of 4.0 A in the positive x direction, makes an angle of 30 degree with a uniform magnetic field of 0.85 T. Find the vector force on the wire.

Explanation / Answer

2) R = pL/A

= 5.5*10^-8*0.5 / (0.5*0.5*10^-4)

= 1.1*10^-3 ohm

5) F = BIL sin a

F = 0.85*4*0.1* sin 30

= 0.17 N

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