Question

When the potentials of two ends of a wire differ by 10 volts, the current flowing between the two ends is recorded as 2mA. What is the resistance offered by the wire?

• A. $4.5k\Omega$
• B. $6k\Omega$
• C. $5k\Omega$
• D. $5.5k\Omega$

Answer 1

The correct option is C $5k\Omega$

Given:
Potential difference between the two ends, $V=10V$
Current flowing between the two ends,
$I=2mA=2\times {10}^{-3}A$

Let resistance of the wire be $R$

According to Ohm's law:
$V=IR$
$R=\frac{V}{I}$
$R=\frac{10}{2\times {10}^{-3}}=5\times {10}^3\Omega$
$R=5k\Omega$