Two spherical conductors B and c of equal radii and carrying equal charge on them repel each other with a force F when kept apart at some distance.A third spherical conductor having some radius as that of B but uncharged is brought in contact with B and then with C and removed away from both.The new force of repulsion between B and C
F/4
3F/4
F/8
3F/8
Which of the following is a non polar dielectric ?
Hcl
NH3
H2O
O2
Two charged balls attract each other with a certain force.If they are allowed to touch and then separated to the same distance appart the two balls will
Attract with smaller force
Attract with greater force.
Repel with smaller force
Repel with greater force.
A parallel plate capacitor is charged by connecting the plates to a battery. The battery remains connected and a glass plate is inserted between the plates of the capacitor then
charge in the capacitor increases
charge in the capacitor decreases
voltage on the capacitor increases
voltage on the capacitor decreases
The supply of an additional charge to a charged capacitor will
Reduce its potential
Increase its potential
Reduce its capacity
Reduce the permittivity of the medium.
Electric potential at the equatorial point of a dipole is
1/4π∈0 P/r2
-1/4π∈0 P/r2
1/4π∈0 P/r
Zero
The energy acquired when an alpha particles is accelerated through a potential difference of 1 volt is :
1 ev
2 ev
4 ev
0
Which of the following will not alter the capacitance of a parallel plate capacitor ?
Change is the area of the plates
Change is the distance between the plates
Change is the dielectric medium
Change is the charging potential
A copper slab of thickness d/2 is introduced between the plates of a parallel plate capacitor of plate separation d. If the capacitance of the capacitor without copper slab is c and with copper slab is c', then c '/c is
√2
2
1
1/√2
If the distance between the plates of a charged parallel plate capacitor is reduced to half of its original value, the capacity of the capacitor is
Increased two times
Reduced to half of its original value
Increased to 4 times
Remains unaltered
