Question

On increasing resistance in a circuit, current in it

• A. increases
• B. decrease
• C. increases up to a certain point and drastically decreases
• D. decrease up to a certain point and then increases rapidly.

Answer 1

The correct option is B

decrease

The explanation for the correct option:

In the case of option B.

1. Resistance is the opposition that a substance offers to the flow of electric current.
2. It is measured in ohms$\left(\Omega \right)$.
3. Mathematically, according to ohm's law

$R=\raisebox{1ex}{$V$}\!\left/ \!\raisebox{-1ex}{$I$}\right.$, where $R$=resistance, $V$= voltage, $I$=current.

So $$\begin{gathered} R\propto \frac{1}{I} \\ OrI\propto \raisebox{1ex}{$1$}\!\left/ \!\raisebox{-1ex}{$R$}\right. \end{gathered}$$, Resistance is inversely proportional to current and vice versa.

If resistance increases, current decreases.

Thus, the correct option is option B.

The explanation for the incorrect options:

In the case of option A.

1. An increase in resistance can not let the increase in current.
2. As it is evident from the above equation that Resistance is inversely proportional to current.
3. Thus, option A is an incorrect option.

In the case of options C and D.

1. This option also does not holds good according to ohm's law.
2. Thus, option C is an incorrect option.

Thus, the correct option is option B.