Electrostatics

Q. A dipole consists of two charges +q and -q separated by a distance d. What is the expression for the dipole moment?
  • A. qd
  • B. q/d
  • C. q^2d
  • D. q/d^2
Q. A dipole consists of two charges +q and -q separated by a distance d. What is the dipole moment?
  • A. qd
  • B. q/d
  • C. q^2d
  • D. q/d^2
Q. A dipole consists of two equal and opposite charges separated by a distance of 0.1m. What is the dipole moment if each charge is 1μC?
  • A. 1 × 10^-7 C m
  • B. 1 × 10^-6 C m
  • C. 1 × 10^-5 C m
  • D. 1 × 10^-4 C m
Q. A dipole consists of two equal and opposite charges separated by a distance. What happens to the dipole moment if the distance is doubled?
  • A. It doubles
  • B. It halves
  • C. It remains the same
  • D. It quadruples
Q. A dipole moment is defined as the product of charge and the distance between the charges. What is the dipole moment of a dipole consisting of charges +2μC and -2μC separated by 0.1m?
  • A. 4 × 10^-7 C m
  • B. 2 × 10^-7 C m
  • C. 2 × 10^-6 C m
  • D. 4 × 10^-6 C m
Q. A dipole moment p is placed in a uniform electric field E. What is the torque experienced by the dipole?
  • A. pE
  • B. pE sin θ
  • C. pE cos θ
  • D. 0
Q. A hollow cylinder with charge density λ is placed along the z-axis. What is the electric field at a point outside the cylinder?
  • A. λ/(2πε₀r)
  • B. λ/(4πε₀r²)
  • C. Zero
  • D. λ/(ε₀r)
Q. A hollow sphere has a charge +Q distributed uniformly on its surface. What is the electric field at a point inside the sphere?
  • A. Q/(4πε₀r²)
  • B. 0
  • C. Q/(4πε₀R²)
  • D. Q/(4πε₀R)
Q. A hollow sphere has a charge Q distributed uniformly over its surface. What is the electric field inside the sphere?
  • A. Q/(4πε₀R²)
  • B. 0
  • C. Q/(4πε₀)
  • D. Q/(4πε₀R)
Q. A hollow sphere has a charge Q uniformly distributed on its surface. What is the electric field inside the sphere?
  • A. Q/4πε₀R²
  • B. 0
  • C. Q/ε₀
  • D. Q/4πε₀
Q. A hollow sphere with charge Q has a radius R. What is the electric field at a point inside the sphere?
  • A. Q/(4πε₀R²)
  • B. 0
  • C. Q/(4πε₀R)
  • D. Q/(2πε₀R²)
Q. A hollow spherical conductor carries a charge Q. What is the electric field inside the cavity?
  • A. Q/(4πε₀r²)
  • B. 0
  • C. Q/(4πε₀R²)
  • D. Q/(4πε₀R)
Q. A long straight wire carries a uniform linear charge density λ. What is the electric field at a distance r from the wire?
  • A. λ/(2πε₀r)
  • B. λ/(4πε₀r²)
  • C. λ/(2πε₀r²)
  • D. 0
Q. A parallel plate capacitor has a potential difference of V across its plates. What is the electric field between the plates?
  • A. V/d
  • B. d/V
  • C. V²/d
  • D. d²/V
Q. A point charge +Q is placed at the center of a spherical Gaussian surface of radius R. What is the electric flux through the surface?
  • A. 0
  • B. Q/ε₀
  • C. Q/(4πε₀R²)
  • D. Q/(4πε₀R)
Q. A point charge +Q is placed at the center of a spherical Gaussian surface. What is the total electric flux through the surface?
  • A. 0
  • B. Q/ε₀
  • C. Q/4πε₀
  • D. 4πQ/ε₀
Q. A point charge of +5 µC is placed at the origin. What is the electric potential at a point 2 m away from the charge?
  • A. 1125 V
  • B. 450 V
  • C. 225 V
  • D. 0 V
Q. A point charge of +Q is placed at the center of a spherical Gaussian surface. What is the total electric flux through the surface?
  • A. 0
  • B. Q/ε₀
  • C. Q/2ε₀
  • D. 4πQ/ε₀
Q. A point charge of +Q is placed at the center of a spherical shell of radius R with surface charge density σ. What is the electric field inside the shell?
  • A. 0
  • B. Q/(4πε₀R²)
  • C. σ/ε₀
  • D. Q/(4πε₀R)
Q. A point charge Q is placed at the center of a cube. What is the electric flux through one face of the cube?
  • A. Q/ε₀
  • B. Q/6ε₀
  • C. Q/4ε₀
  • D. 0
Q. A point charge Q is placed at the center of a spherical Gaussian surface. What is the electric flux through the surface?
  • A. 0
  • B. Q/ε₀
  • C. Q/4πε₀
  • D. Q²/ε₀
Q. A spherical conductor has a charge Q. What is the electric potential inside the conductor?
  • A. 0
  • B. Q/(4πε₀r)
  • C. Q/(4πε₀R)
  • D. Constant throughout
Q. A spherical conductor has a radius R and carries a charge Q. What is the electric potential on its surface?
  • A. kQ/R
  • B. kQ/2R
  • C. 0
  • D. kQ/R²
Q. A spherical Gaussian surface of radius R encloses a charge Q. What is the electric field at a distance 2R from the center?
  • A. Q/4πε₀R²
  • B. Q/4πε₀(2R)²
  • C. 0
  • D. Q/ε₀(2R)²
Q. A spherical shell of radius R carries a total charge Q. What is the electric field at a point outside the shell?
  • A. 0
  • B. Q/(4πε₀R²)
  • C. Q/(4πε₀R)
  • D. Q/(4πε₀R³)
Q. A spherical shell of radius R carries a uniform charge Q. What is the electric field inside the shell?
  • A. Q/(4πε₀R²)
  • B. 0
  • C. Q/(4πε₀R)
  • D. Q/(4πε₀)
Q. A spherical shell of radius R carries a uniform surface charge density σ. What is the electric field inside the shell?
  • A. 0
  • B. σ/ε₀
  • C. σ/2ε₀
  • D. σ/4ε₀
Q. A uniform electric field of 200 N/C is present. What is the potential difference between two points 3 m apart?
  • A. 600 V
  • B. 400 V
  • C. 200 V
  • D. 800 V
Q. A uniformly charged sphere of radius R has a total charge Q. What is the electric field at a point outside the sphere (r > R)?
  • A. 0
  • B. Q/(4πε₀r²)
  • C. Q/(4πε₀R²)
  • D. Q/(4πε₀R)
Q. For a charged plane sheet, if the surface charge density is doubled, what happens to the electric field?
  • A. It remains the same
  • B. It doubles
  • C. It halves
  • D. It quadruples
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