Question

Q1) A charge 16 uC flows from point A to B, work done on charge is 16 *10^-3J, what is the potential of A if potential of B is Vb = 1100 volt?

(1) 50 V
(2) 100 V
(3) 150 V
(4) 200 V


Q2) 15 joule of work has to be done against an existing electric field to take a charge of 0.01 C from A to B. Then the potential difference (VA-VB) is

(1) 1500 volt
(2) 150 volt
(3) 0.15 volt
(4) 0.0015 volt

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Answer 1

Answer:

Hope this helps you.

Answer 2

Solution 1:

• Charge = 16 uC
• V_(B) = 1100 V
• Work done = 16 × 10^(-3) J

So, voltage at A will be :

$V_{B} -V_{A} = \dfrac{work}{charge}$

$\implies 1100 - V_{A} = \dfrac{16 \times {10}^{ - 3} }{16 \times {10}^{ - 6} }$

$\implies 1100 - V_{A} = 1000$

$\implies V_{A} = 100 \: volt$

So, potential at A is 100 Volt (Option 2)

Solution 2:

• Work done = 15 J
• Charge = 0.01 C

So, potential difference will be :

$\Delta V= \dfrac{work}{charge}$

$\implies \Delta V= \dfrac{15}{0.01}$

$\implies \Delta V= 1500 \: volt$

So, potential difference is 1500 V (Option 1)