3. Find the current i in Fig. 3. (5%)

4. Find the current \( I \) in Fig. 4. (5%)

5. Find the current $I_1$ in Fig. 5. (5%)

6. Find the current \( I_1 \) and \( I_2 \) in Fig. 6. (10%)

7. Find the current \( I_1 \) pass through the \( 8\Omega \) resistor and the short-circuit current \( I_2 \) in Fig. 7. (15%, 5% for \( I_1 \) and 10% for \( I_2 \))

8. The wire is 10m long with 5A current passing through. The directions of the magnetic fields are shown in Fig. 8a and 8b. Their magnetic flux densities are both $1Wb/m^2$. Find the two magnetic forces on the current-carrying wires in Fig. 8a and 8b. (10%)

9. In Fig. 9, ε=100V, R1=10Ω, R2=20Ω, R3=30Ω, and L=2H. Immediately after switch S is closed, what are (a) i₁ and (b) i₂? A long time later, what are (c) i₁ and (d) i₂? The switch S is then reopened. Just then, what are (e) i₁ and (f) i₂? A long time later, what are (g) i₁ and (h) i₂? (16%)

10. For the magnetic circuit of Fig. 10, the current \( i \) flows through the coil of \( N \) turns. The mean core length is \( \ell_c \), and the air gap length is \( \ell_g \). Assume no magnetic leakage. The flux crossing the cross-sectional area \( A \). The relative permeability of core is \( \mu_r \). The permeability of air is \( \mu_0 \). Find the flux in the air gap. (10%)

(1) A company is looking to purchase and replace a fixed asset for $2,100,000. It will sell the asset that will be replaced for $410,000 but will incur a $10,000 gain upon that sale. It must also commit $300,000 of working-capital to the investment. The firm's tax rate is 20%. Required: What is the amount of the relevant initial investment?

(2) The NTPU Company orders most of its items in lot sizes of 10 units. Average annual demand per side of beef is 720 units per year. Ordering costs are $25 per order with an average purchasing price of $100. Annual inventory carrying costs are estimated to be 40% of the unit cost. Required: Determine the annual cost savings if NTPU Company changes its order size from 10 units to the economic order quantity.

(3) NTPU Corporation makes miniature statues of the Empire State Building from cast iron. Sales total 50,000 units a year. The statues are finished either rough or polished, with an average demand of 60% rough and 40% polished. Iron ingots, the direct material, costs $5 per pound. Processing costs are $300 to convert 30 pounds into 60 statues. Rough statues are sold for $17 each, and polished statues can be sold for $19 or engraved for an additional cost of $5. Polished statues can then be sold for $40. Required: Determine whether NTPU Company should sell the engraved statutes. Why?

115年 - 115 台灣聯合大學系統_學士班轉學考試_A3／A6：普通物理#142629

115年 - [無官方正解]115 國立臺灣大學_轉學生招生考試試題：普通物理學(A)#142625

115年 - 115 台灣聯合大學系統_碩士班招生考試_物理類：普通物理#139676

115年 - [無官方正解]115 國立中山大學_碩士班考試入學招生考試試題_物理系：普通物理#138395

115年 - [無官方正解]115 國立臺灣大學_碩士班招生考試：普通物理學#137725

114年 - 114 國立嘉義大學_轉學生招生考試試題：普通物理#143735

114年 - [無官方正解]114 國立成功大學_碩士班招生考試_物理學系：普通物理學#138760

114年 - [無官方正解]114 國立中山大學_碩士班招生考試試題_物理系：普通物理#137736

114年 - 114 台灣聯合大學系統_碩士班招生考試：普通物理#137733

114年 - [非官方正解]114 臺灣綜合大學系統_學士班轉學生聯合招生考試試題：普通物理Ａ#129365