Gauss's Law and its application

What is the no. of electric field lines coming out of a +1 coulomb charge

A rectangular loop is held perpendicular to a uniform E-field (the loop's normal vector, dA, is parallel to the E-field direction). At what angle to its normal does the loop have to be turned through so the electric flux is one half of its original value?

• 15 degrees

• 30 degrees

• 45 degrees

• 60 degrees

• 90 degrees

A positive charge is enclosed by a spherical surface. What direction is the electric flux relative to the surface/

• tangent

• from the inside to the outside of the surface

• from the outside to the inside of the surface

• the lines do not pass through the surface

A charge of magnitude, q, is at the center of a sphere of radius r. What is the electric flux at the surface of the sphere? r = 0.53 m, q = 5.0 x 10^-6 C

• 5.6 x 10^5 Nm*m/C

• 6.5 x 10^5 Nm*m/C

• 7.3 x 10^5 Nm*m/C

• 1.1 x 10^6 Nm*m/C

• 1.3 x 10^6 Nm*m/C

You are trying to calculate the e-field outside a positive line of charge. The Gaussian surface should be what kind of geometrical object?

• circle

• cylinder

• cube

• sphere

• rectangle

A metal sphere of radius R is given a positive charge, q. What is the electric field at a distance r from the center, where r > R?

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What is the graph of the electric field for a charged conducting sphere of radius R?

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What is the magnitude of the electric field right outside an infinite plane of charge?

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A solid non-conducting sphere has a radius R and a charge of +Q uniformly distributed throughout its volume. Which graph below describes the electric field as a function of distance r from the center of the sphere?

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The area vector for a flat surface

• is parallel to the surface and has a magnitude equal to the length of a side of the surface.
• is perpendicular to the surface and has a magnitude equal to the length of a side of the surface.
• is parallel to the surface and has a magnitude equal to the area of the surface.
• is perpendicular to the surface and has a magnitude equal to the area of the surface.