Question

ons per second
Through a given cross section n, electrons per second are
n cross section n, electrons per second are passing from left to right and n protons per se
are passing from right to left simultaneously The electric current through that cross section is (e - electronic
charge)
(1) (n + n)e toward left
(2) (nz- n,)e toward right
(3) (n.2 + n 2)e toward left
(4) (n22 - n,)e toward right​

Answer 1

Given:

A cross sectional area.

n electrons passes through the cross section per second from left to right.

n protons passes per second from right to left

To Find:

The electric current through that cross section .

Solution:

Its given the e is the electronic charge.

• Charge of electron = -e
• Charge of proton = +e

• Number of electrons = n/sec
• Number of protons = n/sec
• Current due to electrons = -ne left to right = ne , right to left.
• Current due to protons = ne, right to left.

Therefore the total electric current will be in a direction opposite to flow if electrons.

The total electric current is (n +n)e towards left.