Problem 24.23 What is the direction of the magnetic force in the figure (a)? An

Question

Problem 24.23 What is the direction of the magnetic force in the figure (a)? An electron moves with a speed of 1.5x107 m/s in the directions shown in (Figure 1) below. A 0.30 T magnetic field points in the positive x-direction O-z direction O +z direction O yz direction r- z direction Submit My Answers Give Up Part C What is the magnitude of the magnetic force in figure (b)? Express your answer with the appropriate units. Figure 1 of 1 FBValue Units Submit My Answers Give Up Part D What is the direction of the magnetic force in the figure (b)? 45 +2 direction y direction +yz direction O-yz direction

Explanation / Answer

Part B

In Fig. (a), the electron is moving along -ve y-axis i.e. -j direction

magnetic force = charge x ( velocity x magnetic field)

= - x ( -j x i ) ( as charged particle is an electron, hence -ve sign is taken for charge)

= - ( k)

= - z-axis

so option a is the answer

PART C

magnetic force = charge x ( velocity x magnetic field )

= 1.6 x 10-19 x ( 1.5 x 107 x 0.3 )

= 0.72 x 10-12 N

PART D

In Fig. (b), the electron is moving along -y+z plane i.e. (-j+k)

magnetic force = charge x ( velocity x magnetic field)

= - x ( (-j +k) x i ) ( as charged particle is an electron, hence -ve sign is taken for charge)

= - ( k+j)

= - (yz) direction

so option d is the answer

all the best in the course work

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