Question

If an electric current is passed through a nerve, the man ___________.
A. begins to laugh
B. begins to weep
C. is excited
D. becomes insensitive to pain

Answer 1

Hint: If an electric current is run into a nerve, it interferes with the impulses' ability to travel through the nerves, making the person less sensitive to pain.

Formula used:
The formula of Current is,
$I = \dfrac{q}{t}$
where $q$ is the total charge flowing in $t$ amount of time.

Complete step by step solution:
Electrons are little particles that are part of a substance's molecular structure. These electrons can be held loosely or securely depending on the situation. Electrons can move freely inside the confines of the body when the nucleus is only lightly holding them.

Because electrons are negatively charged particles, they cause a number of charges to flow when they move, and we refer to this movement of charges as an electric current.
We know that, $I = \dfrac{q}{t}$
So, greater the amount of charge flowing per unit time, greater is the magnitude of current.

When an electric current interferes with the conduction of the impulses in the nerves then the individual will lose his sensitivity to pain. Due to the electric energy, the nerves will become weak and numb. There is some, but not much, resistance to the current provided by the nerve tissue. Serious injury, amnesia, seizures, or even a respiratory arrest may result from this. Consequently, a man is excited.

Hence, option C is the correct answer.

Note: When an electric current interferes with the conduction of the impulses in the nerves then the individual will lose his sensitivity to pain. Due to the electric energy, the nerves will become weak and numb.