Exam 19: Electric Forces and Electric Fields

A rod (length = 2.0 m)is uniformly charged and has a total charge of 40 nC.What is the magnitude of the electric field at a point which lies along the axis of the rod and is 3.0 m from the center of the rod?

A particle (charge = +40 $\mu$ C)is located on the x axis at the point x = -20 cm,and a second particle (charge = -50 $\mu$ C)is placed on the x axis at x = +30 cm.What is the magnitude of the total electrostatic force on a third particle (charge = -4.0 $\mu$ C)placed at the origin (x = 0)?

Which one of the following cannot be a statement of Gauss's Law for some physical situation?

An uncharged spherical conducting shell surrounds a charge -q at the center of the shell.The charges on the inner and outer surfaces of the shell are respectively

Two infinite parallel surfaces carry uniform charge densities of 0.20 nC/m² and-0.60 nC/m².What is the magnitude of the electric field at a point between the two surfaces?

A uniform electric field $\overrightarrow { \mathbf { E } } _ { \mathrm { I } }$ is present in the region between the infinite parallel planes of charge A and B,and a uniform electric field $\overrightarrow { \mathbf { E } } _ { \text {II} }$ is present in the region between the infinite parallel planes of charge B and C.When the planes are vertical and the fields are both non-zero,

Suppose a uniform electric field of 4 N/C is in the positive x direction.When a charge is placed at and fixed to the origin,the resulting electric field on the x axis at x = 2 m becomes zero.What is the magnitude of the electric field at x = 4 m on the x axis at this time?

A long straight metal rod has a radius of 2.0 mm and a surface charge of density 0.40 nC/m².Determine the magnitude of the electric field 3.0 mm from the axis.

A 4.0-pC point charge is placed at the center of a hollow (inner radius = 2.0 cm,outer radius = 4.0 cm)conducting sphere which has a net charge of 4.0 pC.Determine the magnitude of the electric field at a point which is 6.0 cm from the point charge.

A charge of +80 $\mu$ C is placed on the x axis at x = 0.A second charge of -50 $\mu$ C is placed on the x axis at x = 50 cm.What is the magnitude of the electrostatic force on a third charge of 4.0 $\mu$ C placed on the x axis at x = 30 cm?

In the figure,if Q = 30 $\mu$ C,q = 5.0 $\mu$ C,and d = 30 cm,what is the magnitude of the electrostatic force on q?

Charge of uniform linear density (4.0 nC/m)is distributed along the entire x axis.Determine the magnitude of the electric field on the y axis at y = 2.5 m.

A +20-nC point charge is placed on the x axis at x = 2.0 m,and a -25-nC point charge is placed on the y axis at y = -3.0 m.What is the direction of the electric field at the origin?

The xy plane is "painted" with a uniform surface charge density which is equal to 40 nC/m².Consider a spherical surface with a 4.0-cm radius that has a point in the xy plane as its center.What is the electric flux through that part of the spherical surface for which z > 0?

The electron gun in a television tube accelerates electrons (mass = 9.11 *10 ^{- 31} kg,charge = 1.60 *10 ^{- 19} C)from rest to 3.00 * 10⁷ m/s within a distance of 2.00 cm.What electric field is required?

Three pith balls supported by insulating threads hang from a support.We know that ball X is positively charged.When ball X is brought near balls Y and Z without touching them,it attracts Y and repels Z.Since pith is an insulating material,we can conclude that

A point charge is located at the origin.Centered along the x axis is a cylindrical closed surface of radius 10 cm with one end surface located at x = 2 m and the other end surface located at x = 4 m.If the magnitude of the electric flux through the surface at x = 2 m is 4 N .m²/C,what is the magnitude of the electric flux through the surface at x = 4 m?

A charge of 50- $\mu$ C is placed on the y axis at y = 3.0 cm and a 77- $\mu$ C charge is placed on the x axis at x = 4.0 cm.If both charges are held fixed,what is the magnitude of the initial acceleration of an electron released from rest at the origin?

A uniform linear charge of 2.0 nC/m is distributed along the x axis from x = 0 to x = 3 m.Which of the following integrals is correct for the x component of the electric field at y = 2 m on the y axis?

Charge of uniform density (80 nC/m³)is distributed throughout a hollow cylindrical region formed by two coaxial cylindrical surfaces of radii 1.0 mm and 3.0 mm.Determine the magnitude of the electric field at a point which is 2.0 mm from the symmetry axis.