Question

Please help me with these question ASAP, I would thumb up for your answer. What is...

Please help me with these question ASAP, I would thumb up for your answer.

What is the period of motion, if an electron moves perpendicular to a magnetic field of magnitude 0.4 mT? (The mass and charge of an electron can be looked up in the text)

A. 8.9 x 10-14 s

B. 4.5 x 10-14 s

C. 2.2 x 10-14 s

D. 5.5 x 10-14 s

If the voltage in a region was given by the function V(x,y)=Ax2y where A is a constant with the appropriate constants, what is the electric field in component form.

A. Ex= 2Axy & Ey=2Axy

B. Ex = -2Axy & Ey = -Ax2

C. Ex = 2Axy & Ey = Ax2

D. Ex = 2Axy & Ey = Ax2y

A spherical capacitor consists of two concentric metal spheres with a voltage applied between them. If the inner radius of the sphere is a = 2.0 mm, the outer radius is b = 5.0 cm, and the voltage between the spheres is 5.0 V, what is the charge on one of the spheres?

A. 0.9 pC

B. 3.7 pC

C. 1.9 pC

D. 1.2 pC

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