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2. Electric Potential and Capacitance
medium

$1\,mC$ વિદ્યુતભારથી $1\ metre$ અંતરે $2\,g$ દળ અને$1\,\mu \,C$ વિદ્યુતભાર ધરાવતો કણ મુકત કરતાં કણનો $10\ metres$ અંતરે વેગ કેટલા .......$m/s$ થાય?

A

$100$

B

$90$

C

$60$

D

$45$

Solution

$9 \times {10^9} \times \frac{{{{10}^{ – 3}} \times {{10}^{ – 6}}}}{1} = 9 \times {10^9} \times \frac{{{{10}^{ – 3}} \times {{10}^{ – 6}}}}{{10}} + \frac{1}{2} \times (2 \times {10^{ – 3}})\,{v^2}$$ \Rightarrow $ ${v^2} = 8100$ $ \Rightarrow $ $v = 90\,\,{\rm{m/sec}}$

Standard 12
Physics

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