Question

Five volts is placed across a 400-turn primary coil. Another 400-turn coil is used as the secondary. The voltage across the secondary is measured for the core configurations indicated in Figure 11: (a) no core, (b) straight cross-piece, (c) open U-shaped core, and (d) cross-piece closing U-shaped core.

Core type	Input Voltage (V)	Output Voltage (V)
no core	5	0.23
straight core	5	2.27
open U core	5	1.74
closed U core	5	4.15

Table 4. Secondary voltages for different core configurations.

1. Calculate the percent transmission of the voltage for each configuration.

2. Which core type gives the maximum transfer of voltage to the second coil?

3. Develop a theory to explain the difference between the types. (Hint: What effect does the core type have on the transfer of magnetic flux?)

Answer 1

Solution: Core type Input Voltage (V) Output Voltage (V) Ceren data no core 5 0.23 straight core 5 2.27 open U core 5 1.74 closed U core 5 4.15 1. We have to find percentage transmission of voltage y tronsonission = Output voltage x 100 Infout voltage a. for no core % transmission = 0-23 X 100 5 - 4.6 %.

b. Straight core - % bonsmission = 2.27 X 100 5 = 45.4%. 2.27 c. Oßen u care- xloo % transmission - 1.74 5 = 34.8. d. closed u care- 7. transmissions 4:15 X 100 5 83 y. 2. Cleartly we can see here closed maximum transfer of voltage care geres the secondary sede to

3 . no Voltage transfer to secondary cail defends on linking of magnetic flees between both coils. And, magnetic fleese a permeability (Mo) → So in first case, when there is care, then bermeabilite of alle(r) is 1. So there is minimum flux linking to secondary coil As a result only 4.6% voltage transferred to secondary role Now, shape of care in fleux linking. In open shapes no returor bath for flua, so fleex linking less than close Shapes also play a key there is ) IS

No - returory Her gap C D D D Close loof al Therefore, there is high % of transmission in closed u care (83%) than ofen u core ( 34.8%). Io Straight care, there is also no returor Bath but low reluctance than oppen u care so it has better transmissies than ofen u core.
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