ᴄᴀʟᴄᴜʟᴀᴛᴇ ᴛʜᴇ ɴᴏ ᴏғ ᴇʟᴇᴄᴛʀᴏɴs ғʟᴏᴡɪɴɢ ᴛʜʀᴏᴜɢʜ ᴛʜᴇ ᴄʀᴏss sᴇᴄᴛɪᴏɴ ᴏғ ᴄᴏɴᴅᴜᴄᴛᴏʀ ᴡʜᴇɴ ᴄᴜʀʀᴇɴᴛ ᴏғ 20 ᴍA ғʟᴏᴡs ғᴏʀ 50 sᴇᴄᴏɴᴅs
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Answered by
1
GiVEN :-
- Current (I) = 20 mA
- Time taken (t) = 50 seconds
- Charge of an electron (e) = 1.6 × 10⁻¹⁹ C
TO FiND :-
- Number of electrons (n) .
CALCULATiON :-
Convert the unit of current from mA to A
- ⇒ 1 mA = 0.001 A
- ⇒ 20 mA = 20(0.001)
- ⇒ 0.02 A
Now, we know that :-
I = Q/t
⇒ I = ne/t
- ⇒ 0.02 = (n × 1.6 × 10⁻¹⁹)/50
- ⇒ 0.02(50) = 1.6 × 10⁻¹⁹ n
- ⇒ 1 = 1.6 × 10⁻¹⁹ n
- ⇒ n = 1/(1.6 × 10⁻¹⁹)
- ⇒ n = 1/1.6 × 1/10⁻¹⁹
- ⇒ n = 0.625 × 10¹⁹
- ⇒ n = 6.25 × 10¹⁸
FiNAL AÑSWER :-
- 6.25 × 10¹⁸ electrons are flowing through the cross section of the conductor
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Answered by
0
- I = ne/t
- 0.02 = (n × 1.6 × 10⁻¹⁹)/50
- 0.02(50) = 1.6 × 10⁻¹⁹ n
- 1 = 1.6 × 10⁻¹⁹ n
- n = 1/(1.6 × 10⁻¹⁹)
- n = 1/1.6 × 1/10⁻¹⁹
- n = 0.625 × 10¹⁹
- n = 6.25 × 10¹⁸
6.25 × 10¹⁸ electrons are flowing through the cross section of the conductor
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