posits the first column, pick the corresponding position of the second and write the chosen digits under the corresponding letters. Physical quantity A) internal energy of steam B) internal energy of water B) water temperature Answer: A B B.2 Establish the correspondence between devices and physical quantities that underlie their operation. For each position in the first column, choose the corresponding position in the second and write the chosen digits under the corresponding letters. Device A) Compass B) Electrometer B) Electric motor Answer: A B B C.1 What is the current strength in a nichrome conductor of length 12 m and cross-section 4 mm², on which a voltage of 36 mV is applied? (The specific resistance of steel is 0.4 Ohm mm²/m.

Question

Вопрос:

posits the first column, pick the corresponding position of the second and write the chosen digits under the corresponding letters. Physical quantity A) internal energy of steam B) internal energy of water B) water temperature Answer: A B B.2 Establish the correspondence between devices and physical quantities that underlie their operation. For each position in the first column, choose the corresponding position in the second and write the chosen digits under the corresponding letters. Device A) Compass B) Electrometer B) Electric motor Answer: A B B C.1 What is the current strength in a nichrome conductor of length 12 m and cross-section 4 mm², on which a voltage of 36 mV is applied? (The specific resistance of steel is 0.4 Ohm mm²/m.

Ответ:

ФИО:Телефон:Емаил:Полное описание сути нарушения прав (почему распространение данной информации запрещено Правообладателем):

Accepted Answer

Exercise B.1

Instructions: Match the physical quantities in the first column with the character of their change in the second column. Write the chosen letters under the corresponding numbers in the table.

Matching:

Physical Quantity	Character of Change
A) Internal energy of steam	2) Increases
B) Internal energy of water	2) Increases
B) Water temperature	2) Increases

Answer Table:

A	B	B
2	2	2

Exercise B.2

Instructions: Match the devices in the first column with the physical phenomena that underlie their operation. For each position in the first column, choose the corresponding position in the second and write the chosen digits under the corresponding letters.

Matching:

Device	Physical Phenomena
A) Compass	1) Interaction of permanent magnets
B) Electrometer	3) Electrization of bodies upon impact
B) Electric motor	5) Effect of a magnetic field on a current-carrying conductor

Answer Table:

A	B	B
1	3	5

Exercise C.1

Problem: What is the current strength in a nichrome conductor of length 12 m and cross-section 4 mm², on which a voltage of 36 mV is applied? (The specific resistance of steel is 0.4 Ohm mm²/m.

Given:

Length, $$l = 12$$ m
Cross-sectional area, $$S = 4$$ mm²
Voltage, $$U = 36$$ mV
Specific resistance, $$\rho = 0.4$$ Ohm·mm²/m

Solution:

Convert units to SI:
- Voltage: $$U = 36 \text{ mV} = 36 \times 10^{-3} \text{ V}$$
Calculate the resistance of the conductor using the formula: $$R = \rho \frac{l}{S}$$
- $$R = 0.4 \frac{\text{Ohm} \times \text{mm}^2}{\text{m}} \times \frac{12 \text{ m}}{4 \text{ mm}^2}$$
- $$R = 0.4 \times 3$$ Ohm
- $$R = 1.2$$ Ohm
Calculate the current strength using Ohm's Law: $$I = \frac{U}{R}$$
- $$I = \frac{36 \times 10^{-3} \text{ V}}{1.2 \text{ Ohm}}$$
- $$I = 30 \times 10^{-3}$$ A
- $$I = 0.03$$ A

Answer: The current strength is 0.03 A.