2. Questions Bank
  3. 12th Class
  4. Physics
  5. Electric Charges and Fields

12th Class Physics Electric Charges and Fields Question Bank MCQ - Electric Charges and Fields

  • question_answer
    A polythene piece rubbed with wool is found to have a negative charge of \[6\times {{10}^{-7}}C\]. The number of electrons transferred to polythene from wool is:

    A) \[3.75\times {{10}^{10}}\]

    B) \[9.6\times {{10}^{10}}\]

    C) \[9.6\times {{10}^{12}}\]

    D) \[3.75\times {{10}^{12}}\]

    Correct Answer: D

    Solution :

    (d) \[3.75\times {{10}^{12}}\] Here \[q=-6\times {{10}^{-7}}C\] \[\therefore \]Number of electrons transferred from wool to polythene, \[n=\frac{q}{e}=\frac{-6\times {{10}^{-7}}}{-1.6\times {{10}^{-19}}}=3.75\times {{10}^{2}}\]


You need to login to perform this action.
You will be redirected in 3 sec spinner