The figure shows the electric lines of force emerging from a charged body. If the electric fields at A and B are EA and EB respectively and if the distance between A and B is r, then:
1. EA > EB
2. EA < EB
3. EA = EBr
4. EA = EBr2
ABC is an equilateral triangle. Charges +q are placed at each corner. The electric intensity at O will be:
1. | 14πϵ0qr2 | 2. | 14πϵ0qr |
3. | zero | 4. | 14πϵ03qr2 |
The magnitude of electric field intensity E is such that, an electron placed in it would experience an electrical force equal to its weight is given by
(1) mge
(2) mge
(3) emg
(4) e2m2g
1. | Always along a line of force |
2. | Along a line of force, if its initial velocity is zero |
3. | Along a line of force, if it has some initial velocity in the direction of an acute angle with the line of force |
4. | None of the above |
An uncharged sphere of metal is placed in between two charged plates as shown. The lines of force look like
(1) A
(2) B
(3) C
(4) D
1. | σε0 and is parallel to the surface |
2. | 2σε0 and is parallel to the surface |
3. | σε0 and is normal to the surface |
4. | 2σε0 and is normal to the surface |
The magnitude of electric field E in the annular region of a charged cylindrical capacitor
(1) Is same throughout
(2) Is higher near the outer cylinder than near the inner cylinder
(3) Varies as 1/r, where r is the distance from the axis
(4) Varies as 1/r2, where r is the distance from the axis
A metallic solid sphere is placed in a uniform electric field. The lines of force follow the path(s) shown in figure as
(1) 1
(2) 2
(3) 3
(4) 4
The figure shows some of the electric field lines corresponding to an electric field. The figure suggests
(1) EA > EB > EC
(2) EA = EB = EC
(3) EA = EC > EB
(4) EA = EC < EB
A hollow insulated conducting sphere is given a positive charge of 10μC. What will be the electric field at the centre of the sphere if its radius is 2 meters
(1) Zero
(2) 5 μCm–2
(3) 20 μCm–2
(4) 8 μCm–2