1. Which of the following materials is most suitable for use as the core of an electromagnet? a
Aluminium
b
Steel
c
Soft iron
d
Copper
2. A wire carrying a current in a magnetic field may experience a force. Which of the following devices does NOT depend on this force?

a
Electric motor
b
Loudspeaker
c
Moving caoil galvanometer
d
Electromagnet
3. The rule which relates the direction of an electric current to its magnetic field is called:

a
Fleming's Left Hand Rule
b
Maxwell's Corkscrew Rule
c
Maxwell's Left Hand Rule
d
Fleming's Right Hand Rule
4. Which of the following statements is/are true?

I. Like magnetic poles attract each other

II. In magnetism, forces of attraction and repulsion are both experienced

III. The magnitude of the repulsive force between two magnetics poles increases with their separation.

a
II and III only
b
I only
c
II only
d
I and II only

Two identical 82 mg dust particles very far apart (pee 0) are moving directly toward each other at a speed of 3698 m/s. the charge on each is-719 ? c. determine how close they will get to each other. let k = 9x109 n-m2/c2 & ignore gravity.

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?

How many hydrogen (h) atoms are in one molecule of sulfuric acid, h2so4? (1 points) 1 2 4 7