#20a6 Please help me, thank you Consider the following. #20a6 Please help me, th

Question

#20a6

Please help me, thank you

Consider the following.

#20a6 Please help me, thank you Consider the following. What is the resistance for the two cases? How does Ohm's law relate current to voltage? (b) Suppose ? = 4.00 cm, w = 2.2 cm, and h = 2.00 cm; the battery voltage is 1.5 V and I1 = 2.70 A, determine the value of I2. (a) A rectangular block has the dimensions ? ? w ? h. When a battery with a voltage V is connected across the end faces as shown in the left figure above, a current I1 flows through the circuit. If the same battery is connected across the top and bottom faces of the block as shown in the right figure, what is the current I2 that flows through the circuit? Give your answer in terms of I1. (Use the following as necessary: ?, w, h, I1) I2

Explanation / Answer

For 1st case:
Cross-section Area A = hw

length = l

suppose resistivity of this material is p.

so R1 = pl/hw

I1 = V/ R1 = hwV /pl

For 2nd Case:

Cross-section Area A = lw

length = h

suppose resistivity of this material is p.

so R2 = ph/lw

I2 = V/ R2 = lwV /ph

I2/ I1 = (lwV /ph )/ (hwV /pl ) = l^2 / h^2

I2 = I1 (l/h)^2 ..........Ans

---------------

I2 = lwV /ph

Vlw/hI2 = p

R1 = pl/hw   = (Vlw/hI2)l / hw = V*l^2 / I2 *h^2

R2 = ph/lw   = (Vlw/hI2)h/lw    = V / h^2 * I2

b)

I2 = I1 (l/h)^2 = 2.70 x (4/2)^2 = 10.8 A

Related Questions

Navigate

• Browse (All)
• Browse #
• Subjects

---

---

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.