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The problem asks to calculate the charge transferred during a lightning strike, given the current and the duration.

The formula to calculate the charge (\( Q \)) is:

\[
Q = I \times t
\]

Where:
- \( I \) is the current in amperes (A),
- \( t \) is the time in seconds (s),
- \( Q \) will be in coulombs (C).

### Given values:
- \( I = 2.5 \times 10^4 \, A \)
- \( t = 20 \, \mu s \) (microseconds, \( 1 \, \mu s = 10^{-6} \, s \))

Now, converting the time to seconds:
\[
t = 20 \, \mu s = 20 \times 10^{-6} \, s = 2.0 \times 10^{-5} \, s
\]

### Calculating the charge:
\[
Q = (2.5 \times 10^4 \, A) \times (2.0 \times 10^{-5} \, s) = 0.50 \, C
\]

Thus, the charge transferred is \( 0.50 \, C \).

### Correct answer: **c. 0.50 C**

Would you like further details on this? 

Here are 5 related questions to explore:

1. How does the unit microsecond (\( \mu s \)) compare to other time units like milliseconds and nanoseconds?
2. What is the significance of current in real-life scenarios like lightning strikes?
3. How do different materials affect the transfer of charge?
4. How do you convert between different units of charge, such as coulombs and microcoulombs?
5. What are other instances in physics where charge transfer is important?

**Tip:** Always check unit conversions carefully, as they can significantly affect your final result!

During a lightning strike to earth, a current of 2.5x10^4 A flows for a time of 20 µs. How much charge is transferred by this event?

Solve the problem of charge transfer during a lightning strike where a current of 2.5x10^4 A flows for 20 µs. Learn how to apply the formula Q = I × t to calculate the transferred charge. Suitable for high school students.

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