Related Mcqs:

1. 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

2. 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

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

   A. 100 kV/m
   B. 10 kV/m
   C. 5 kV/m
   D. 2 kV/m

4. 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

5. 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

6. 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

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. 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

9. The time constant of an R-C circuit is defined as the time during which capacitor charging voltage actually rises to _________ percent of its value

   A. 37, initial
   B. 62, initial
   C. 62, final
   D. 37, final

10. If free space between the plates of a capacitor is replaced by a dielectric_____________?

    A. The potential difference remains constant capacittance and energy stored increases
    B. The potential difference remains constant capacittance decreases and energy increases
    C. The potential difference decreases but both capacitance and energy increase
    D. both potential difference and capacitance decrease but energy increases