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For the circuit shown in the figure, what is the current through resistor R1? [I1curr][I1units]

An RC circuit is connected across an ideal DC voltage source through an open switch. The switch is closed at time t = 0 s. Which of the following statements regarding the circuit are correct? (There may be more than one correct choice.)  

Three equal negative point charges are placed at three of the corners of a square of side d as shown in the figure. Which of the arrows represents the direction of the net electric field at the center of the square? e. The field is 0 at the point in the middle of the square.  

If a rectangular area is rotated in a uniform electric field from the position where the maximum electric flux goes through it to an orientation where only half the flux goes through it, what has been the angle of rotation?  

Two equal positive charges are held in place at a fixed distance. If you put a third positive charge midway between these two charges, its electrical potential energy of the system (relative to infinity) is zero because the electrical forces on the third charge due to the two fixed charges just balance each other.  

An electron is initially moving to the right when it enters a uniform electric field directed upwards. Which trajectory shown below will the electron follow? (W, X, Y, Z)

An oil-water mixture works as an insecticidal spray against mosquitoes and other insects because it _____.

The magnitude of the Poynting vector of a planar electromagnetic wave has an average value of 0.939 W/m2. The wave is incident upon a rectangular area, 1.5 m by 2.0 m, at right angles.  (a) How much total electromagnetic energy falls on the area over 1.0 minute?    [energy][units] (b) What are the amplitudes of the electric and magnetic fields of this wave?  E: [Emag][Eunits] B:[Bmag][Bunits]

What is the current through the inner (lone) 1.0kΩ resistors in the RC circuit below at time 0.25ms after the switch is closed? The potential across the capacitors is initially 5.0V. [RCcurr][RCunits]

In a certain region, the electric potential due to a charge distribution is given by the equation V(x,y,z) = 3x2y2 + yz3 – 2z3x, where x, y, and z are measured in meters and V is in volts. Calculate the magnitude of the electric field vector at the position (x,y,z) = (1.0, 1.0, 1.0).  [Efield][Eunits]