4. Anything will help thanks a. True/False and Multiple Choice T or F Magnetic f

Question

4. Anything will help thanks a. True/False and Multiple Choice T or F Magnetic field lines come out of the south pole of a magnet and enter at the north pole T or F A magnetic field can do work on a charged particle. T or F A charged particle can experience force from three different kinds of fields at once. Tor F. The geographic South Pole of the Earth is the magnetic North Pole of the Earth. A + 2-mC charge is at rest in a magnetic field of 2 T pointing along the + x-axis. What is the force acting on this charge in the magnetic field? A) + 4 mN B) 0 N C) -4 mN D) + 2 mN A particle with charge = 4.00 times 10^-9 C is traversing a uniform magnetic field with a strength 2.50 Tesla that is directed out of the plane of the paper. The velocity of the particle is 130 times 10^8 m/s. The particle is traveling along the x-axis, as shown. What is the magnitude of the force on the particle? What is the direction of the force? a. Up (+y direction) b. Out of the paper c. To the right d Down (-y direction) e Into the paper An electron (q = -60 times 10^-19 C) is injected into a uniform magnetic field given by B = (4.2 i + 2.5 j) T. Find the vector expression for the force on the electron when its velocity is v = 5.50 times 10^6 j m/s.

Explanation / Answer

a) false

true

false

true

f = qvB

if v = 0

f = 0N

b) 1) f = qvB = 4*10^-9*1.3*10^8*2.5 = 1.5 N

2) f = i*k = -j down negative y direction

c) f = q(v*B) = -1.6*10^-19*(5.5*10^6*4.2(-k)+0)

f = 36.96*10^-13 k N

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