A Simple Way to Measure Magnetic Fields A loop of wire is at the edge of a region of space containing a uniform magnetic field B. The plane of the loop is perpendicular to the magnetic field. Now the loop is pulled out of this region in such a way that the area A of the coil inside the magnetic field region is decreasing at the constant rate c. That is, dAdt=−c, with c>0.
A. The induced emf in the loop is measured to be V. What is the magnitude B of the magnetic field that the loop was in?
Express your answer in terms of some or all of the variables A, c, and V.
B. For the case of a square loop of side length L being pulled out of the magnetic field with constant speed v, what is the rate of change of area c=−dAdt?
Express your answer in terms of L and v.
C. Later, you will learn, if you have not already, that the "motional emf" E associated with a rod of length L moving through a uniform magnetic field of magnitude Bwith speed v is given by:
E=vLB,
or, equivalently,
B=EvL.
This is another way of thinking about the result derived above. If you have already studied this, can you see which sides of the square loop contribute to the motional emf and which do not, and why?

You have been consulted by the mobile phone company hookup about a new augmented reality product called “brows”. they want to develop an alternative to google glasses, which, you recall, is a proposed new product which plans to superimpose a whole range of wireless google services over the user’s ordinary vision of the world. these appear in little circles and ovals, and let you phone people, take photographs, navigate across cities and inside buildings, find shops and update your social media. brows would do this too, but not be limited to special google services. the user would wear a small cylinder-shaped device designed to fit on top of their existing eyewear (glasses or sunglasses). it would project a reversed image onto the inside of the lenses, the reflection of which would be in focus for the user. instead of voice control, the user would control the device by eye and neck movements, which the device would track. the device would connect via bluetooth to the user’s phone, which would supply most of the computing power and wireless connectivity. hookup also wants to know what existing services would be most in demand, and which would not work well with brows. using your knowledge of augmented reality, wearable technology and interface design, is the project feasible? if not, why not? if feasible, how could the product need to be modified for a better experience?

You win the lottery and decide to impress your friends by exhibiting a million-dollar cube of gold. at the time, gold is selling for $ 426.60 per troy ounce, and 1.0000 troy ounce equals 31.1035 g. -how tall would your million-dollar cube be? en cm

Which compound is held together by the electrostatic force between two ions? a. co2 b. cci4 c. h2s d. mgf2