ABC is an equilateral triangle. Charges +*q* are placed at each corner. The electric intensity at *O* will be

(1) $\frac{1}{4\pi {\epsilon}_{0}}\frac{q}{{r}^{2}}$

(2) $\frac{1}{4\pi {\epsilon}_{0}}\frac{q}{r}$

(3) Zero

(4) $\frac{1}{4\pi {\epsilon}_{0}}\frac{3q}{{r}^{2}}$

PMT - 1985

Concept Questions :-

Electric field

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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) $\frac{mg}{e}$

(3) $\frac{e}{mg}$

(4) $\frac{{e}^{2}}{{m}^{2}}g$

PMT - 1975

Concept Questions :-

Electric field

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A charge particle is free to move in an electric field. It will travel

(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

Concept Questions :-

Electric field

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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*

PMT - 1985

Concept Questions :-

Electric field

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The electric field near a conducting surface having a uniform surface charge density σ is given by

(1) $\frac{\sigma}{{\epsilon}_{0}}$ and is parallel to the surface

(2) $\frac{2\sigma}{{\epsilon}_{0}}$ and is parallel to the surface

(3) $\frac{\sigma}{{\epsilon}_{0}}$ and is normal to the surface

(4) $\frac{2\sigma}{{\epsilon}_{0}}$ and is normal to the surface

PMT - 1994

Concept Questions :-

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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/*r*^{2}, where *r* is the distance from the axis

Concept Questions :-

Electric field

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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

Concept Questions :-

Electric field

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The figure shows some of the electric field lines corresponding to an electric field. The figure suggests

(1) *E _{A}* >

(2) *E _{A}* =

(3) *E _{A}* =

(4) *E _{A}* =

PMT - 1999

Concept Questions :-

Electric field

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A hollow insulated conducting sphere is given a positive charge of 10μ*C*. What will be the electric field at the centre of the sphere if its radius is 2 meters** **

(1) Zero

(2) 5μ *Cm*^{–2}

(3) 20μ *Cm*^{–2}

(4) 8μ *Cm*^{–2}

PMT - 1998

Concept Questions :-

Electric field

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An electron of mass *m _{e}* initially at rest moves through a certain distance in a uniform electric field in time

(1) 1

(2) ${({m}_{p}/{m}_{e})}^{1/2}$

(3) ${({m}_{e}/{m}_{p})}^{1/2}$

(4) 1836

Concept Questions :-

Electric field

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