A positively charged ball hangs from a silk thread. We put a positive test charge q0 at a point and measure F/q0, then it can be predicted that the electric field strength E 

(1) > F/q0

(2) = F/q0

(3) < F/q0

(4) Cannot be estimated

Concept Questions :-

Electric field
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A solid metallic sphere has a charge +3Q. Concentric with this sphere is a conducting spherical shell having charge –Q. The radius of the sphere is a and that of the spherical shell is (b > a). What is the electric field at a distance R(a < R < b) from the centre 

(1) Q2πε0R

(2) 3Q2πε0R

(3) 3Q4πε0R2

(4) 4Q4πε0R2 

Concept Questions :-

Electric field
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A point charge q is placed at a distance a/2 directly above the centre of a square of side a. The electric flux through the square is 

(1) qε0

(2) qπε0

(3) q4ε0 

(4) q6ε0

Concept Questions :-

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Two infinitely long parallel wires having linear charge densities λ1 and λ2 respectively are placed at a distance of R meters. The force per unit length on either wire will be K=14πε0

(1) K2λ1λ2R2

(2) K2λ1λ2R

(3) Kλ1λ2R2 

(4) Kλ1λ2R

Concept Questions :-

Electric field
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The charge on 500 cc of water due to protons will be 

(1) 6.0 × 1027 C

(2) 2.67 × 107 C

(3) 6 × 1023 C

(4) 1.67 × 1023 C

  1. If both the assertion and the reason are true and the reason is a correct explanation of the assertion
  2. If both the assertion and reason are true but the reason is not a correct explanation of the assertion
  3. If the assertion is true but the reason is false
  4. If both the assertion and reason are false

Concept Questions :-

Coulomb's law
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The electric field in a region is radially outward with magnitude E=Aγ0. The charge contained in a sphere of radius γ0 centered at the origin is 

(1) 14πε0Aγ03

(2) 4πε0Aγ03

(3) 4πε0Aγ0

(4) 14πε0Aγ03

Concept Questions :-

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Charge q is uniformly distributed over a thin half-ring of radius R. The electric field at the centre of the ring is 

(1) q2π2ε0R2

(2) q4π2ε0R2 

(3) q4πε0R2

(4) q2πε0R2

Concept Questions :-

Electric field
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In the given figure two tiny conducting balls of identical mass m and identical charge q hang from non-conducting threads of equal length L. Assume that θ is so small that tanθsinθ, then for equilibrium x is equal to 

(1) q2L2πε0mg13

(2) qL22πε0mg13

(3) q2L24πε0mg13

(4) q2L4πε0mg13

Concept Questions :-

Coulomb's law
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Three positive charges of equal value q are placed at the vertices of an equilateral triangle. The resulting lines of force should be sketched as in 

(1)   (2)

(3)    (4)

Concept Questions :-

Electric field
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Two equal charges are separated by a distance d. A third charge placed on a perpendicular bisector at x distance will experience maximum coulomb force when 

(1) x=d2

(2) x=d2

(3) x=d22

(4) x=d23

Concept Questions :-

Coulomb's law
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