Question

(/br) Ten million electrons pass from point p to q in one micro second. find current and direction of it (/br) ​

Answer 1

Here, number of electron, n=10000000=10

7

Total charge on ten million electrons is

Q=ne[Where e=1.6×10

−19

C]

=10

7

×1.6×10

−19

C=1.6×10

−12

C

Time taken by ten million electrons to pass from point P to point Q is t=I μs=10

−6

s

The current

I=

t

Q

=

10

−6

1.6×10

−12

=1.6×10

−6

A

Since the direction of the current is always opposite to the direction of flow of electrons. Therefore due to flow of electrons from point P to point Q the current will flow from point Q to point P.

Answer 2

Answer:

Explanation:

The intensity of current is - 1.6*10^-6 A

Direction of current will be from Point Q to Point P.

Number of electrons - 10 million = 10^7

T = 1 microsecond = 10^-6 s

Current is defined as flow of charge per unit time.

Thus, I = q/t

Q = number of electrons* charge on 1 electron

Charge on 1 electron = - 1.6*10^-19 C.

I = - 1.6*10^-19*10^7/10^-6

I = - 1.6*10^-6 C/s

I = - 1.6*10^-6 A

Since, the sign is negative, hence direction of current will be from Point Q to Point P.

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