A potential of 400 V is applied to a capacitor, the plates of which are 4 mm apart. The strength of electric field is___________?

Related Mcqs:

1. A 5 μF capacitor has a potential difference across its plates of 200 volts. The charge on the capacitor is____________?

   A. 2.5 x 10-8 C
   B. 10-5 C
   C. 103 C
   D. 4 x 103 C

2. Two plates of a parallel plate capacitor after being charged from a constant voltage source are separated apart by means of insulated handles, then the____________?

   A. Voltage across the plates increases
   B. voltage across the plates decreases
   C. charge on the capacitor decreases
   D. charge on the capacitor increases

3. Two infinite parallel plates 10 mm apart have maintained between them a potential difference of 100 V. The acceleration of an electron placed between them is______________?

   A. 0.56 x 1015 m/s2
   B. 1.5 x 1015 m/s2
   C. 1.6 x 1015 m/s2
   D. 1.76 x 1015 m/s2

4. While testing a capacitor with ohm meter, if the capacitor shows charging, but the final resistance reading is appreciably less than normal, it can be concluded that the capacitor is____________?

   A. short-circuited
   B. open circuited
   C. alright
   D. leaky

5. When a dielectric slab is introduced in a parallel plate capacitor, the potential difference between plates will______________?

   A. remain uncharged
   B. decrease
   C. increase
   D. become zero

6. The electric charge of 100 °C is 13cm apart from another charge 16.9°C electric force between them is_____________?

   A. 9x107N
   B. 900N
   C. 9x105N
   D. 9x106N

7. A capacitor having capacitance of 5 uF is charged to a potential difference of 10,000 V. The energy stored in the capacitor is__________?

   A. 50 joules
   B. 150 joules
   C. 200 joules
   D. 250 joules

8. Energy stored in the electric field of a capacitor C when charged from a D.C source of voltage V is equal to joules_______________?

   A. CV2
   B. C2V
   C. CV2
   D. CV

9. A positive and a negative charge are initially 50 mm apart. When they are moved close together so that they are now only 10 mm apart, the force between them will be________________?

   A. 5 times smaller than before
   B. 5 times greater than before
   C. 10 times greater than before
   D. 25 times larger than before

10. Electric intensity at any point in an electric field is equal to the at that point?

    A. electric flux
    B. magnetic flux density
    C. potential gradient
    D. none of the above