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NEET - Grade 12 - Physics - Moving Charges and Magnetism - Introduction and Snapshot of Moving Charges and Magnetism - Study ref# 815

Introduction: Both Electrically and Magnetism have been known for more than 2000 years. However, it was only about 200 years ago, in 1820, that it was realized that they were intimately related. During a lecture demonstration in the su... read more

NEET - Grade 12 - Physics - Moving Charges and Magnetism - Introduction and Snapshot of Moving Charges and Magnetism - Study ref# 816

Following section must be covered to understand the Moving Charges and Magnetism: 1. Introduction 2. Magnetic Force 3. Motion in a Magnetic Field 4. Motion in Combined Electric and Magnetic Fields 5. Magnetic Field due to a Cu... read more

NEET - Grade 12 - Physics - Electromagnetic Induction - Introduction and Snapshot of Electromagnetic Induction - Study ref# 821

Introduction: Electricity and magnetism were considered separate and unrelated phenomena for a long time. In the early decades of the nineteenth century, experiments on electric current by Oersted, Ampere and a few others established t... read more

NEET - Grade 12 - Physics - Electric Charges and Fields - Introduction and Snapshot of Electric Charges and Fields - Study ref# 806

Introduction: All of us have the experience of seeing a spark or hearing a crackle when we take off our synthetic clothes or sweater, particularly in dry weather. This is almost inevitable with ladies garments like a polyester saree. H... read more

NEET - Grade 12 - Physics - Electric Charges and Fields - Introduction and Snapshot of Electric Charges and Fields - Study ref# 807

Following sections must be covered to understand the Electrical Charges and Fields: 1. Introduction 2. Electric Charges 3. Conductors and Insulators 4. Charging by Induction 5. Basic Properties of Electric Charge 6. Coulomb’s ... read more

NEET - Grade 12 - Physics - Electric Charges and Fields - Target Setup for Electric Charges and Fields - Study ref# 808

Student requires to achieve the following milestones to get better grip over Electrical Charges And Fields. The milestones / targets are as follows: Starting Point: Days 0Test TypeAppear on TestTarget TestsScorePractice Test000%C... read more

NEET - Grade 12 - Physics - Electric Charges and Fields - Study ref# 10460

Check that the ratio  is dimensionless . Look up a table of physical constants and determine the value of this ratio. What does the ratio signify? Answer: In the ratio  (constant) ... read more

NEET - Grade 12 - Physics - Electric Charges and Fields - Study ref# 10461

(a) Explain the meaning of the statement ‘electric charge of a body is quantized’. (b) Why can one ignore quantization of electric charge when dealing with macroscopic ,i.e., large scale charges ? Answer: (a) The electric charge of a body is... read more

NEET - Grade 12 - Physics - Electric Charges and Fields - Study ref# 10462

When a glass rod is rubbed with a silk cloth, charges appear on both. A similar phenomenon is observed with many other pairs of bodies. Explain how this observation is consistent with the law of conservation of charge. Answer: According to t... read more

NEET - Grade 12 - Physics - Electric Charges and Fields - Study ref# 10463

(a) An electrostatic field line is a continuous curve. That is, a field line cannot have sudden breaks. Why not? (b) Explain why two field lines never cross each other at any point ? Answer: (a) An electrostatic field line represents the ... read more

NEET - Grade 12 - Physics - Electric Charges and Fields - Study ref# 10464

Two point charges  and  are located 20 cm apart in vacuum. (a) What is the electric field at the mid-point O of the line AB joining the two charges? (b) If a negative test char... read more

NEET - Grade 12 - Physics - Electric Charges and Fields - Study ref# 10465

An electric dipole with dipole moment C-m is aligned at 30° with the direction of a uniform electric field of magnitude  Calculate the magnitude of the torque acting on the dipole. Answer: Given, dipole moment  C-m Electric fi... read more

NEET - Grade 12 - Physics - Electric Charges and Fields - Study ref# 10466

Suppose the spheres A and B have identical sizes . A third sphere of the same size but uncharged is brought in contact with the first, then brought in contact with the second , and finally removed from both . What is the new force of repulsi... read more

NEET - Grade 12 - Physics - Electric Charges and Fields - Study ref# 10467

Consider a uniform electric field   (a) What is the flux of this field through a square of 10 cm on a side whose plane is parallel to the Y-Z plane? (b) What is the flux through the same square if the normal to its plane makes a 60#*... read more

NEET - Grade 12 - Physics - Electric Charges and Fields - Study ref# 10468

A point charge +10μC is at a distance 5 cm directly above the centre of a square of side 10 cm, as shown in figure. What is the magnitude of the electric flux through the square? (Hint- Think of the square as one face of a cube with e... read more

NEET - Grade 12 - Physics - Electric Charges and Fields - Study ref# 10469

A conducting sphere of radius 10 cm has an unknown charge. If the electric field 20 cm from the center of the sphere is    and points radially inwards, what is the net charge on the sphere? Answer: Let the value of unknown cha... read more

NEET - Grade 12 - Physics - Electric Charges and Fields - Study ref# 10470

An infinite line charge produces a field of  at a distance of 2 cm. Calculate the linear charge density. Hints- To find the linear charge density, use the formula of electric field due to infinite linear charge distribution. Answer: ... read more

NEET - Grade 12 - Physics - Electric Charges and Fields - Study ref# 10471

Which among the curves shown in figures cannot possibly represent electrostatic field line?                         Hints – It is based on the presence of electric field lines. Answer: (a) According to the properties of electric li... read more

NEET - Grade 12 - Physics - Electric Charges and Fields - Study ref# 10472

Obtain the formula for the electric field due to a long thin wire of uniform linear charge density  without using Gauss’s law. [Hint: Use Coulomb’s law directly and evaluate the necessary integral.] Answer: Let us consider a long ... read more

NEET - Grade 12 - Physics - Electric Charges and Fields - Study ref# 10473

An arbitrary surface encloses a dipole. What is the electric flux through this surface? Answer: If any arbitrary surface encloses a dipole, the net charge is zero because the total charge on the dipole is zero (dipole consists of two equal a... read more

NEET - Grade 12 - Physics - Electric Charges and Fields - Study ref# 10474

Sketch the electric field lines for a uniformly charged hollow cylinder shown in figure. Answer: Here, the hollow cylinder is positively charged. We know that the electric lines of force appear to come out from the conductor. Thus, the lines... read more

NEET - Grade 12 - Physics - Electric Charges and Fields - Study ref# 10475

Two charges –q each are fixed separated by distance 2d. A third charge q of mass m placed at the mid-point is displaced slightly by x (x <<d) perpendicular to the line joining the two fixed charged as shown in figure. Show that q will ... read more

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