Electric Field (Discrete and Continuous Charge Distributions)

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Electric Field (Discrete and Continuous Charge Distributions): Overview

This topic covers concepts, such as, Electric Field, Electric Field Due to a Point Charge, Electric Field due to a Large Charged Sheet Using Coulomb's Law & Electric Field near a Conductor etc.

Important Questions on Electric Field (Discrete and Continuous Charge Distributions)

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A charge q is placed at the centre of the line joining two equal charges Q. The system of three charges will be in equilibrium if

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Assertion: Due to two point charges electric field and electric potential cannot be zero at some point simultaneously.

Reason: Field is a vector quantity and potential is a scalar quantity.

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Two point charges q and 2q are placed some distance apart. If the electric field at the location of q be E, then that at the location of 2q will be

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The maximum field intensity on the axis of a uniformly charged ring of charge q and radius R will be

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Two large circular discs separated by a distance of 0.01 m are connected to a battery via a switch as shown in the figure. Charged oil drops of density 900 kg m-3 are released through a tiny hole at the center of the top disc. Once some oil drops achieve terminal velocity, the switch is closed to apply a voltage of 200 V across the discs. As a result, an oil drop of radius 8×10-7 m stops moving vertically and floats between the discs. The number of electrons present in this oil drop is ______.(neglect the buoyancy force, take acceleration due to gravity =10 ms-2 and charge on an electron e=1.6×10-19C)

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Infinite number of charges of magnitude 6 μC each are lying at y=2, 4, 8, 16 metre on Y-axis. The value of electric field intensity at point y=0 due to these charges will be a×104 N C-1, find the value of a,

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The tracks of three charged particles in a uniform electrostatic field are shown in the figure. Which particle has the highest charge to mass ratio?
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If the flux of the electric field through a closed surface is zero then

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The constant k in Coulomb’s law depends on

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A metal plates of capacitor of area 0.01 m2 carries a charge of 100 μC. Calculate the outward pull on plate (in newton).

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A metallic shpere is placed in a uniform electric field. The line of force follow the path(s) shown in the figure as,

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The maximum field intensity on the axis of a uniformly charged ring of charge q and radius R will be

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A thin conducting ring of radius R is given a charge +Q. The electric field at the centre O of the ring due to the charge on the part AKB of the ring is E. The electric field at the centre due to the charge on the part ACDB of the ring is

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The tracks of three charged particles in a uniform electrostatic field are shown in the figure. Which particle has the highest charge to mass ratio?

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If the flux of the electric field through a closed surface is zero

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The constant k in Coulomb’s law depends on

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Two point charges of 20 μC and 80 μC are 10 cm apart where will the electric field strength be zero on the line joining the charges from 20 μC charge

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A small metal ball is suspended in an uniform electric field with the help of an insulated thread. If a high energy X-ray beam falls on the ball, then the ball

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The electric intensity outside a charged sphere of radius R at a distance r(r>R) is

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The minimum strength of a uniform electric field that can tear a conducting neutral thin-walled sphere into two equal parts is known to be E0. Then determine the minimum electric field strength required to tear a sphere of one-fourth of the radius with the same wall thickness.