A cathode emits 1.8× 1014 electrons per second, when heated, when 400V is applied to anode all the emitted electrons reach the anode. The charge on electron is 1.6× 10- 19C . The maximum anode current is :-

Question

A cathode emits 1.8× 1014 electrons per second, when heated, when 400V is applied to anode all the emitted electrons reach the anode. The charge on electron is 1.6× 10- 19C . The maximum anode current is :- (A) 27μ A (B) 29μ A (C) 72μ A (D) 29mA

Tardigrade Admin · Accepted Answer

i=(Q/t)=(n e/t)=1.8× 1014× 1.6× 10- 19 =28.8× 10- 6A=29μ A

Q. A cathode emits $1.8 \times 1 0^{14}$ electrons per second, when heated, when $400 V$ is applied to anode all the emitted electrons reach the anode. The charge on electron is $1.6 \times 1 0^{- 19} C$ . The maximum anode current is :-

$27 μ A$

$29 μ A$

$72 μ A$

$29 m A$

$i = \frac{Q}{t} = \frac{n e}{t} = 1.8 \times 1 0^{14} \times 1.6 \times 1 0^{- 19}$
$= 28.8 \times 1 0^{- 6} A = 29 μ A$

Q. A cathode emits 1.8×1014 electrons per second, when heated, when 400V is applied to anode all the emitted electrons reach the anode. The charge on electron is 1.6×10−19C . The maximum anode current is :-

27μA

29μA

72μA

29mA