phy2049_f11_final_practice

# 5 cm as shown in the figure what is the magnitude of

This preview shows page 1. Sign up to view the full content.

This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: is sent between two parallel electric plates with an electric field between them of E = - 2x10^4 N/C j- hat N/C . If the electron beam travels perpendicular to the electric field with a velocity of v = 4.2x 10^7 m/s in the +i - hat direction, what magnetic field is necessary (direction and magnitude) so that the electrons continue traveling in a straight line without deflection by the electric field? 5. Part of a long insulated wire carrying current i = 4A is bent into a circular section of radius R = 1.5 cm as shown in the figure. What is the magnitude of the magnetic field (in T) at the center of curvature C if the circular section lies in the plane of the page as shown? (1) 1.1 x 10- 4 (2) 5.3 x 10- 5 (3) 1.7 x 10- 4 (4) 2.2 x 10- 4 (5) 5.0 x 10- 6 6. A series RLC circuit is driven by a sinusoidally- varying EMF source. The current lags the EMF by 30°. What can be concluded about the driving frequency ω? 1 1 1 (1) ω = (2) ω < (3) ω > (4) ω = 0 (5) ω = ∞ LC LC LC 7. A constant current of i = 3A is used to charge a parallel plate capacitor with circular plates of radius R = 1cm. What is the magnitude of the magnetic field at a radius of r = 0.3 cm, which is less than R, in the region between the plates? (1) 3.8 x 10- 6 T (2) 6 x 10- 5 T (3)...
View Full Document

{[ snackBarMessage ]}

Ask a homework question - tutors are online