Question

The multiplicative inverse of a number is the number itself, then its initial value is

• A. $i$
• B. $-1$
• C. $2$
• D. $-i$

Answer 1

The correct option is B

$-1$

Explanation for the correct option:

Option B:

Multiplicative inverse: the multiplicative inverse of a number say, $N$ is represented by $\frac{1}{N}$ or $N^{-1}$.

Multiplicative inverse of $-1=$$\frac{1}{-1}$

$=-1$

So, option B is correct.

Explanation for the incorrect options:

Option A: multiplicative inverse of $i=$$\frac{1}{i}$

$\ne i$

Hence, option A is incorrect.

Option C: multiplicative inverse of $2=$$\frac{1}{2}$

$\ne 2$

Hence, option C is also incorrect.

Option D: multiplicative inverse of $-i=$$\frac{1}{-i}$

$\ne -i$

So, option D is also incorrect.

Hence, option B is the correct option.