The high temperature of the Sun's corona ionizes iron atoms so that there are a significant number of Fe ions in the corona. (This notation indicates that a neutral iron atom has lost 11 electrons.) Suppose that an Fe ion is at the location . What is the net electric force on an electron that is at the location ?
The HCl molecule is polar with a dipole moment and a negative partial charge at the chlorine atom and a net positive partial charge at the hydrogen atom. From infrared spectroscopy, the bond length of a HCl molecule is calculated to be 0.13 nm. If you model the HCl molecule as a dipole of charges and separated a distance 0.13 nm, what is the charge in the model?
Two dipoles are oriented as shown below. One dipole is made of opposite charges of magnitude , and the other dipole is made of opposite charges of magnitude . Both dipoles have a separation . Derive an equation for the net electric field at the point shown if the distance is much larger than the charge separation . (i.e. )
A thin rod of length has a uniform charge . Derive an expression for the electric field at point P on the axis of the rod that is at a distance from the center of the rod. Show that in the limit as , the electric field due to the rod is the same as if the rod is a charged particle.
A coil of 100 turns and radius 2 cm is in a uniform magnetic field as shown below. The magnetic field changes with time according to the graph.
An electron enters a region of uniform electric field between two closely spaced, oppositely charged plates as shown below with an initial speed of m/s. Upon exiting the region, it has been deflected upward. The horizontal displacement of the electron through the plates is 5 cm, and the plates are separated a distance 5 mm.
An alpha particle is accelerated by two closely spaced, oppositely charged plates, as shown below.
The alpha particle has a speed of m/s when it enters a slit in the positively charged plate. After traveling for 1 mm, it passes through a slit in the negatively charged plate. If the magnitude of the charge of each plate is , and if each plate has an area of , what will be the speed of the alpha particle when it reaches the negatively charged plate? (Note: the plate separation is small compared to the dimensions of the plates.)
A thin rod of length has a uniform charge . (a) Write an expression for the potential difference , if points A and B are very close to the rod in comparison to the length of the rod. (b) Find the potential difference if the rod's length is 1 m, the rod's charge is , point A is 1 mm from the rod, point B is 3 mm from the rod, and point C is 3 mm from the rod and 1 mm from point B.
A coil of 20 turns of wire has a radius 0.5 cm and is connected to a power supply so that 0.4 A flows through the coil. At , the coil is at rest, current flows into the page at the top of the coil, and the plane of the coil makes an angle of with respect to a magnetic field of 0.5 T.
A 1.5-m beam has a 1-kg object hanging from its end. The beam is held in equilibrium at an angle of with respect to the horizontal, as shown below. To hold the beam in equilibrium, you grasp a handlebar of radius 2 cm at the bottom of the beam and exert a tangential force on the handlebar.