The electric potential v as a function of distance x is metres is given by V= (5x2-10x-9) volt. The value of electric filed at x= 1m would be
20 v/m
6 v/m
zero
11 v/m
The kinetic energy of an electron accelerated through a potential of 100x is
1.6x10-17 J
1.6x1017 J
1.6x10-19 J
100J
Inside a hollow charged spherical conductor the potential
Is constant
Varies directly ad the distance from the centre
varies inversely as the distance from the centre
varies inversely as the square of the distance from the centre.
A charge is located at the centre of a circle of radius r. Another charge of the same magnitude q is taken round the circle. The work expended in the process is
1/4π∈0r
q2/4π∈0r
q2/4π∈0r2
There is an electric field E along x direction.If the work done is moving a charge 0.2c through a distance 2m along a line making an angle 60owith the x axis is 4.The value of E is
4N/C
8N/C
16N/C
20N/C
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
The electric potential V at a certain point distant x metre from the origin is given by V(x)= (5x2+10x-9) volt. The electric field at x=1m will be
-10 v/m
10 v/m
-20v/m
Two conducting spheres of radii 5cm and 3cm are charged so that the electric field on their surface are same.The ratio of the charges will be
3:5
5:3
9:25
25:9
The electric field at a certain point is 10NC-1.The electric lines of force crossing unit area around the point at right angles to it is
εo
1/εo
10
10/εo
A hollow metal sphere of radius 5cm is charged such that the potential on its surface is 10v. The potential at the centre of the sphere is
10v
same as at a point 10cm away from the surface
same as at a point 25cm away from the surface
