# $$ABC$$ is an equilateral triangle. Charges $$+q$$  are placed at each corner. The electric intensity at $$O$$ will be:          1. $$\dfrac{1}{4\pi\epsilon _0}\dfrac{q}{r^{2}}$$ 2. $$\dfrac{1}{4\pi\epsilon _0}\dfrac{q}{r^{}}$$ 3. zero 4. $$\dfrac{1}{4\pi\epsilon _0}\dfrac{3q}{r^{2}}$$

Subtopic:  Electric Field |
87%
From NCERT
PMT - 1985
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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) $\frac{{e}^{2}}{{m}^{2}}g$

Subtopic:  Electric Field |
83%
From NCERT
PMT - 1975
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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

Subtopic:  Electric Field |
From NCERT
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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

Subtopic:  Electric Field |
76%
From NCERT
PMT - 1985
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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

Subtopic:  Electric Field |
77%
From NCERT
PMT - 1994
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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/r2, where r is the distance from the axis

Subtopic:  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

Subtopic:  Electric Field |
85%
From NCERT
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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

Subtopic:  Electric Field |
79%
From NCERT
PMT - 1999
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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

Subtopic:  Electric Field |
90%
From NCERT
PMT - 1998
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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 $$t_{1}.$$ A proton of mass $$m_{p}$$ also initially at rest takes time $$t_{2}$$ to move through an equal distance in this uniform electric field. The ratio of $$\frac{t_{2}}{t_{1}}$$ is nearly equal to- (Neglect the effect of gravity.)

1. $$1$$
2. $$\left ( \frac{m_{p}}{m_{e}} \right )^{1/2}$$
3. $$\left ( \frac{m_{e}}{m_{p}} \right )^{1/2}$$
4. $$1836$$

Subtopic:  Electric Field |
61%
From NCERT
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