NEET Physics: Electric Charges and Fields — Practice Set 5

Q1. A charge \( 6 \, \mu\text{C} \) is at the center of a cube of edge 20 cm. What is the total electric flux through the cube?

A. \( 6.0 \times 10^5 \, \text{Nm}^2/\text{C} \)
B. \( 6.78 \times 10^5 \, \text{Nm}^2/\text{C} \)
C. \( 7.5 \times 10^5 \, \text{Nm}^2/\text{C} \)
D. \( 8.0 \times 10^5 \, \text{Nm}^2/\text{C} \)

Q2. A dipole has charges \( +q = 3 \, \mu\text{C} \) and \( -q = -3 \, \mu\text{C} \) separated by 2 mm. What is the dipole moment?

A. \( 3 \times 10^{-9} \, \text{C m} \)
B. \( 6 \times 10^{-9} \, \text{C m} \)
C. \( 9 \times 10^{-9} \, \text{C m} \)
D. \( 1.2 \times 10^{-8} \, \text{C m} \)

Q3. Which property of electric charges is responsible for the fact that charges on a conductor in equilibrium reside only on its surface?

A. Mobility
B. Quantization
C. Additivity
D. Symmetry

Q4. Why does the torque on an electric dipole in a uniform field depend on the sine of the angle between the dipole and the field?

A. Charge symmetry
B. Field uniformity
C. Charge separation
D. Perpendicular component

Q5. Why does the electric field due to an infinite charged sheet remain constant regardless of its thickness?

A. Charge quantization
B. Field symmetry
C. Charge mobility
D. Surface charge density

Q6. What ensures that the electric field outside a neutral conductor in an external field is altered by induced charges?

A. Charge quantization
B. Field cancellation
C. Induced charge separation
D. Charge symmetry

Q7. A plastic rod gains a charge of \( -1.92 \times 10^{-7} \, \text{C} \) when rubbed. How many electrons were transferred to it?

A. \( 1.2 \times 10^{12} \)
B. \( 1.3 \times 10^{12} \)
C. \( 1.4 \times 10^{12} \)
D. \( 1.5 \times 10^{12} \)

Q8. Two point charges \( 4 \times 10^{-7} \, \text{C} \) and \( -8 \times 10^{-7} \, \text{C} \) are 90 cm apart in vacuum. What is the magnitude of the force between them?

A. 0.00356 N
B. 0.0038 N
C. 0.0040 N
D. 0.0042 N

Q9. Two charges \( +4 \, \mu\text{C} \) and \( -6 \, \mu\text{C} \) are 30 cm apart. What is the electric field at a point 15 cm from \( +4 \, \mu\text{C} \) along the line joining them?

A. \( 7.5 \times 10^5 \, \text{N/C} \)
B. \( 8.0 \times 10^5 \, \text{N/C} \)
C. \( 8.5 \times 10^5 \, \text{N/C} \)
D. \( 9.0 \times 10^5 \, \text{N/C} \)

Q10. A closed surface has a net flux of \( 4.52 \times 10^5 \, \text{Nm}^2/\text{C} \). What is the charge enclosed?

A. \( 3.8 \, \mu\text{C} \)
B. \( 3.9 \, \mu\text{C} \)
C. \( 4.0 \, \mu\text{C} \)
D. \( 4.1 \, \mu\text{C} \)

Q11. Three charges \( +4 \, \mu\text{C}, -2 \, \mu\text{C}, +5 \, \mu\text{C} \) are at the vertices of an equilateral triangle of side 1.2 m. What is the force magnitude on \( +4 \, \mu\text{C} \)?

A. 0.12 N
B. 0.13 N
C. 0.144 N
D. 0.15 N

Q12. A closed surface has a net flux of \( 2.26 \times 10^5 \, \text{Nm}^2/\text{C} \). What is the charge enclosed?

A. \( 1.8 \, \mu\text{C} \)
B. \( 1.9 \, \mu\text{C} \)
C. \( 2.0 \, \mu\text{C} \)
D. \( 2.1 \, \mu\text{C} \)

Q13. A dipole with \( p = 6 \times 10^{-9} \, \text{C m} \) is at 60° to a field \( E = 3 \times 10^4 \, \text{N/C} \). What is the torque?

A. \( 1.2 \times 10^{-4} \, \text{N m} \)
B. \( 1.4 \times 10^{-4} \, \text{N m} \)
C. \( 1.5 \times 10^{-4} \, \text{N m} \)
D. \( 1.56 \times 10^{-4} \, \text{N m} \)

Q14. What explains why an electric dipole aligns with an external field when free to rotate?

A. Charge quantization
B. Field symmetry
C. Charge separation
D. Torque

Q15. Two point charges \( 8 \times 10^{-7} \, \text{C} \) and \( -4 \times 10^{-7} \, \text{C} \) are 60 cm apart in vacuum. What is the magnitude of the force between them?

A. 0.008 N
B. 0.009 N
C. 0.010 N
D. 0.012 N

Physics — Electric Charges and Fields

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A charge \( 6 \, \mu\text{C} \) is at the center of a cube of edge 20 cm. What is the total electric flux through the cube?

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