In KI2, we discussed both the audio and video output aspects. We have discussed
ID: 2265791 • Letter: I
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In KI2, we discussed both the audio and video output aspects. We have discussed the audio input section in the above questions. Another important aspect is storage. There are a variety of storage methods, but we will focus on hard-disk drives (HDDs) and magnetic tapes 1) Hard-disk drives: A picture of a hard disk drive is shown below. The part that stores data is labeled as #4 and is called the platter. A platter is made of a hard material such as glass or aluminum coated with a thin layer of metal which can be magnetized or demagnetized. What kind of magnetic material (hard or soft) do you think this metal is and why? www.explainthatstuff.co To read data, hard drives make use of a part called a head, labeled #6 in the diagram above. The head is basically a piece of metal that's wrapped in wire. When a reading data from the disk the arm, #2 above. will move the head to a specific location on the disk while the disk is spinning at several thousand revolutions per minute (RPM). What happens in the head component which allows the rest of the computer to process the data (hint: it processes the data as an electrical signal)? 2) Writing Data: To write data, the process above goes in reverse. Using electromagnetic principles, explain this operation.Explanation / Answer
1)The part in hard disk for storing data is made up of hard magnetic material because hard magnetic materials consist of larger space for storing information and have higher remanent magnetization.
To read data from the disk,electric current passes through the wire and it is segmented into a number of electrical signals and the data is read one by one.
2) To write data into the disk,the electric field gets converted to magnetic field and data is entered in the disk when the recording surface is magnetized.
3)Here the plane is parallel to the magnetic field and the total torque on the circular loop is given as ,
T=2*torque on each side
=2*force*distance
=2*BIL*sin(teta)*b/2
(Force=mag flux density B*current I*length)
=BIA Sin(teta) (Area A=L*b)
Here torque T=Tmech
Tmech=BIA sin(teta)
current I=Tmech/B.A sin(teta)
The magnetic moment is a vector with direction given by unit normal to the plane of the loop.
All losses are neglected here and angular velocity is given as
w=2*pi*N/60 where N is speed
The power generated that is Pmech is proportional to the torque developed in the motor. When torque increases the power also increases. As all the losses are neglected,the input power is more or less equal to the output power.
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