Question

How many electrons flows in 2 minutes through the filament of an electric bulb if a current of 40m A flows through it.

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Answer 1

Answer:

Given Below

Explanation:

This Is Not That Question Answer But It Is Related To That One

Current that passes through the bulbs is 1.6A

Solution:

Use the relation,

I= t Q

t

ne

, where n =number of electrons and e = charge on 1 electron and t = time

Using thevallues given in the question we can write,

1.6A=

1sec

n×e

⟹n=

1.6×10

−19

1.6

[∵ charge on 1 electron = 1.6×10

−19

C]

n=10

19

are the required number of electrons.

Answer By

B.Sai Kumar Yadav

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Answer 2

Key Point :-

Q = I t

where, Q = charge

I = current

t = time

Q = n e

Explanation:

t = 2 min = 2 × 60 sec = 120 sec

I = 40 mA = 40 × 10^(-3) A

Q = 40 × 10^ (-3) × 120 C

= 48 × 10^(-1) C

No. of electrons = Q/e

$\frac{4.8}{1.6 \times {10}^{ - 19} }$

$3 \times {10}^{19} electrons$