If `l_(1),l_(2)` and `l_(3)` are the orders of the currents through our nerves, domestic appliances and average lightening, then the correct order of currents is
(1) `l_(1) gt l_(2) gt l_(3) ` (2) `l_(1) gt l_(3) gt l_(2)`
(3) `l_(1) lt l_(2) lt l_(3)` (4) `l_(1) = l_(2) = l_(3)`

Answer

To solve the question regarding the order of currents through nerves, domestic appliances, and average lightning, we will analyze the current values associated with each scenario.

### Step-by-Step Solution:

1. **Identify the currents:**
- Let \( l_1 \) be the current through our nerves.
- Let \( l_2 \) be the current through domestic appliances.
- Let \( l_3 \) be the current during average lightning.

2. **Determine the order of magnitude for each current:**
- The current through nerves (\( l_1 \)) is typically less than 1 milliampere (mA), which is \( l_1 < 10^{-3} \) A.
- The current through domestic appliances (\( l_2 \)) is generally in the range of 1 ampere (A) to 100 amperes (A), so we can say \( 1 \, \text{A} < l_2 < 100 \, \text{A} \).
- The current during an average lightning strike (\( l_3 \)) can be in the range of kiloamperes (kA) to megaamperes (MA), which means \( 10^3 \, \text{A} < l_3 < 10^6 \, \text{A} \).

3. **Compare the currents:**
- From the above analysis, we can summarize the order of currents:
- \( l_1 < 10^{-3} \, \text{A} \) (Nerves)
- \( 1 \, \text{A} < l_2 < 100 \, \text{A} \) (Domestic appliances)
- \( 10^3 \, \text{A} < l_3 < 10^6 \, \text{A} \) (Lightning)

4. **Establish the correct order:**
- Since \( l_1 \) (current through nerves) is the smallest, followed by \( l_2 \) (current through domestic appliances), and then \( l_3 \) (current during lightning), we can conclude:
\[ l_1 < l_2 < l_3 \]

5. **Select the correct option:**
- The correct order of currents is represented by option (3): \( l_1 < l_2 < l_3 \).

### Final Answer:
The correct order of currents is \( l_1 < l_2 < l_3 \) (Option 3).

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