CUET Top 10 Electrostatics pyqs

Q1. Two point charges A and B, having +Q and -Q respectively are placed at certain distance apart and forcing acting between them is F. If 25% charge of A is transferred to B then the force between the two charges.

(a)4F/3

(b)F

(c)9F/16

(d)16F/9f

Ans.(c)

Q2.Two positive ions, each carrying a charge q, are separated by a distance d, if F is the force of repulsion between the ions the number of electrons missing from each ion will be ( e being the charge on an electron ) .

(a)4πEoFd²/e²

(b)√4πEoFe²/√d²

(c)√4πEoFd²/√e²

(d)4πEoFd²/q²

Ans.(c)

Q3.A charge q is placed at the centre of the line joining two equal charges Q.The system of the three charges will be in equilibrium if q is equal to.

(a)-Q/4

(b)Q/4

(c)-Q/2

(d)Q/2

Ans.(a)

Q4. 

Ans. (a)

Q5. 

Ans. (c)

Q6.A particle of mass m and charge q is placed at rest in uniform electric field E and then released. The kinetic energy attained by the particle after moving a distance y.

(a)qEy

(b)qE²y

(c)qEy²

(d)q²Ey

Ans.(a)

Q7. An electric dipole is placed at an angle of 30° with an electric field intensity 2×10⁵ N/C.It experiences a torque equal to 4 N m. The Charge on the dipole, if the dipole length is 2cm, is.

a) 8 mC

(b) 2 mC

(c) 5 mC

(d) 7 μC

Ans.(b)

Q8. A spherical conductor with a radius of 10 cm has a charge of 3.2x10^7 C distributed uniformly. What is the magnitude of the electric field at a point 15 cm from the center of the sphere? (k=9x10^9 Nm^2/C^2)

(a) 1.28 x 10^7 N/C

(b) 1.28 x 10^5 N/C

(c) 1.28 x 10^6 N/C

(d) 1.28 x 10^7 N/C

Ans.(b)

Q9. Electric field at centre 0 of semicircle of radius a having linear charge density λ given as.

(a)2 λ/Eoa

(b) λπ/Eoa

(c) λ/2πEoa

(d) λ/πEoa

Ans.(c)

Q10. Two parallel infinite line charges with linear charge densities of +λC/m and -λC/m are placed at a distance of 2R in free space. What is the electric field mid-way between the two line charges?

(a)2 λ/EoR

(b) 3 λ/EoR

(c) zero

(d) λ/πEoR

Ans. (d)