Question

Ten million electrons pass from point P to point Q in one micro second. The current and its direction is

• A. 1.6 × 10-14 A, from point P to point Q
• B. 3.2 × 10-14 A, from point P to point Q
• C. 1.6 × 10-6 A, from point Q to point P
• D. 3.2 × 10-12 A, from point Q to point P

Answer 1

Answer: (C)

1.6 × 10-6 A, from point Q to point P

Answer 2

: Here, number of electron, n = 10000000 = $10 ^ { 7 }$ Total charge on ten million electrons is,

$1.6 \times 10 ^ { - 19 } \mathrm { C }$]

$= 10 ^ { 7 } \times 1.6 \times 10 ^ { - 19 } \mathrm { C }$

$= 1.6 \times 10 ^ { - 12 } \mathrm { C }$

Time taken by ten million electrons to pass from point P to point Q is,

The current,

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 pint. P.