Daily Practice Problems undefined Electric Charges and Fields

Question 1.

Which of the following is correct regarding electric charge? [Level : Easy]

(1) If a body is having positive charge, i.e., shortage of electrons

(2) If a body is having negative charge, i.e., excess of electrons

(3) Minimum possible charge = ± 1.6 x C

(4) Charge is quantzed, i.e., Q = ± ne, where n = 1,2,3,4,…..

(a) Both (1) and (2)

(b) Both (2) and (3)

(d) All of these

Question 2.

A conductor has 17.6 x C positive charge. The conductor has (charge on electron = 1.6 x C ) [Level : Medium]

(a) 9 electrons in excess

(b) 11 electrons in short

(d) 9 electrons in short

Question 3.

The electrostatic force on a small sphere of charge 0.6 µC due to another small sphere of charge -1.2 µC in air is 0.4 N. (1) What is the distance between the two spheres? (2) What is the force on the second sphere due to the first? [Level : Easy]

Question 4.

Two protons are placed at some separation in vacuum. Find the ratio of electric and gravitational force acting between them. [Level: Medium]

Question 5.

Four charges Q, q, Q and q are kept at the four corners of a square as shown below. What is the relation between Q and q, so that the net force on a charge q is zero? [Level: Medium]

Question 6.

There are two charges + 1 µC and + 5 µC. The ratio of the forces acting on them will be [Level: Medium]

(a) 1 : 5

(b) 1 : 1

(d) 1 : 25

Question 7.

Electric charges of 1 µC, - 1 µC and 2 µC are placed in air at the corners A, B and C respectively of an equilateral triangle ABC having length of each side 10 cm. The resultant force on the charge at C is [Level: Medium]

(a) 0.9 N

(b) 1.8 N

(d) 3.6 N

Question 8.

A particle ‘A’ having charge q and mass m is placed at the bottom of a smooth inclined plane of inclination . Where should a block B, having same charge and mass, be placed on the incline, so that it may remain in equilibrium? [Level: Medium]

Question 9.

Calculate the magnitude of an electric field which can just suspend a particle of mass 4.3 x kg freely in air. [Level: Medium]

Question 10.

Two positive point charges , are separated in vacuum by a distance of 5m. Find the point on the line between the charges, where the net electric is zero. [Level: Medium]

Question 11.

A block of mass m having charge q is attached to a spring constant k. This arrangement is placed in uniform electric field E on smooth horizontal surface as shown in the figure. Initially, spring is unstretched. Find the extension of spring in equilibrium position and maximum extension of spring. [Level: Medium]

Question 12.

Sixty four drops of radius 0.03 m and each carrying a charge of 7 are combined to form a bigger drop. Find how the surface charge density of electrification will change if no charge is lost. [Level: Difficult]

Question 13.

A charge of C is distributed uniformly over the circumference of a conducting ring of radius 0.4 m. Calculate the field intensity at a point on the axis of the ring at 0.5 m from its center also at the center. [Level: Medium]

Question 14.

A system has two charges, located at points A(0,0,-15 cm) and B(0, 0, +15 cm) respectively. What is the electric dipole moment of the system? [Level: Medium]

Question 15.

Electric field at a far away distance r on the axis of a dipole is . What is the electric field at a distance 2r on perpendicular to bisector? [Level: Medium]

Question 16.

A point charge causes an electric flux of to pass through a spherical Gaussian surface of 10 cm radius centered on the charge. (i) If the radius of the Gaussian surface were doubled, how much flux would pass through the surface? (ii) What is the value of the point charge? [Level: Medium]

Question 17.

A thin spherical shell of metal has a radius of 0.3 m and carries charge of 0.4 micro coulomb. Calculate the electric intensity at 4 m from the center of the shell. [Level : Easy]

Question 18.

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

(i) The electric fields must be zero everywhere on the surface

(ii) The electric field may be zero everywhere on the surface

(iii) The charge inside the surface must be zero

(iv) The charge in the vicinity of the surface must be zero [Level: Easy]

a. (i), (ii)

b. (ii), (iii)

c. (ii), (iv)

d. (i), (iii)

Question 19.

If the electric flux entering and leaving an enclosed surface respectively, is and , then the electric charge inside the surface will be [Level : Easy]

(a)

(b)

(c)

(d)

Question 20.

An electric dipole is situated in an electric field of uniform intensity E whose dipole moment is P and moment of inertia is I. If the dipole is displaced slightly from the equilibrium position, then the angular frequency of its oscillations is [Level: Medium]

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All About Daily Practice Problems on NEET Physics Electric Charges and Fields NCERT Chapter 1

Our Daily Practice Problems (DPPs) offer a diverse range of question types, including Multiple Choice Questions (MCQs) as well as short and long answer types. These questions are categorized into Easy, Moderate, and Difficult levels, allowing students to gradually progress and challenge themselves accordingly. Additionally, comprehensive solutions are provided for each question, available for download in PDF format - Download pdf solutions as well as Download pdf Questions. This approach fosters a holistic learning experience, catering to different learning styles, promoting self-assessment, and improving problem-solving skills. With our well-structured DPPs, students can excel in exams while gaining a deeper understanding of the subject matter. Hope you found the content on NEET Physics Electric Charges and Fields NCERT Chapter 1 useful.

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