Advertisements
Online Mock Tests
Chapters
2: Electrostatic Potential and Capacitance
3: Current Electricity
▶ 4: Moving Charges and Magnetism
5: Magnetism and Matter
6: Electromagnetic Induction
7: Alternating Current
8: Electromagnetic Waves
9: Ray Optics and Optical Instruments
10: Wave Optics
11: Dual Nature of Radiation and Matter
12: Atoms
Chapter 13: Nuclei
Chapter 14: Semiconductor Electronics: Materials, Devices and Simple Circuits
![NCERT solutions for Physics [English] Class 12 chapter 4 - Moving Charges and Magnetism - Shaalaa.com](/images/physics-english-class-12_6:ecf5a31cda3a46679a04fc327e398323.jpg "NCERT solutions for Physics [English] Class 12 chapter 4 - Moving Charges and Magnetism")
Advertisements
Solutions for Chapter 4: Moving Charges and Magnetism
Below listed, you can find solutions for Chapter 4 of CBSE, Karnataka Board PUC NCERT for Physics [English] Class 12.
NCERT solutions for Physics [English] Class 12 4 Moving Charges and Magnetism EXERCISES [Pages 134 - 135]
A circular coil of wire consisting of 100 turns, each of radius 8.0 cm carries a current of 0.40 A. What is the magnitude of the magnetic field B at the centre of the coil?
A long straight wire carries a current of 35 A. What is the magnitude of the field B at a point 20 cm from the wire?
A long straight wire in the horizontal plane carries a current of 50 A in north to south direction. Give the magnitude and direction of B at a point 2.5 m east of the wire.
A horizontal overhead power line carries a current of 90 A in east to west direction. What is the magnitude and direction of the magnetic field due to the current 1.5 m below the line?
What is the magnitude of magnetic force per unit length on a wire carrying a current of 8 A and making an angle of 30° with the direction of a uniform magnetic field of 0.15 T?
A 3.0 cm wire carrying a current of 10 A is placed inside a solenoid perpendicular to its axis. The magnetic field inside the solenoid is given to be 0.27 T. What is the magnetic force on the wire?
Two long and parallel straight wires A and B carrying currents of 8.0 A and 5.0 A in the same direction are separated by a distance of 4.0 cm. Estimate the force on a 10 cm section of wire A.
A closely wound solenoid 80 cm long has 5 layers of windings of 400 turns each. The diameter of the solenoid is 1.8 cm. If the current carried is 8.0 A, estimate the magnitude of B inside the solenoid near its centre.
A square coil of side 10 cm consists of 20 turns and carries a current of 12 A. The coil is suspended vertically and the normal to the plane of the coil makes an angle of 30° with the direction of a uniform horizontal magnetic field of magnitude 0.80 T. What is the magnitude of torque experienced by the coil?
Two moving coil meters, M1 and M2 have the following particulars:
R1 = 10 Ω, N1 = 30,
A1 = 3.6 × 10–3 m2, B1 = 0.25 T
R2 = 14 Ω, N2 = 42,
A2 = 1.8 × 10–3 m2, B2 = 0.50 T
(The spring constants are identical for the two meters).
Determine the ratio of
- current sensitivity and
- voltage sensitivity of M2 and M1.
In a chamber, a uniform magnetic field of 6.5 G (1 G = 10–4 T) is maintained. An electron is shot into the field with a speed of 4.8 × 106 m s−1 normal to the field. Explain why the path of the electron is a circle. Determine the radius of the circular orbit. (e = 1.5 × 10–19 C, me = 9.1 × 10–31 kg)
In the previous question, obtaining the frequency of revolution of the electron in its circular orbit. Does the answer depend on the speed of the electron? Explain.
- A circular coil of 30 turns and radius 8.0 cm carrying a current of 6.0 A is suspended vertically in a uniform horizontal magnetic field of magnitude 1.0 T. The field lines make an angle of 60° with the normal of the coil. Calculate the magnitude of the counter torque that must be applied to prevent the coil from turning.
- Would your answer change, if the circular coil in (a) were replaced by a planar coil of some irregular shape that encloses the same area? (All other particulars are also unaltered.)
Solutions for 4: Moving Charges and Magnetism
NCERT solutions for Physics [English] Class 12 chapter 4 - Moving Charges and Magnetism
Shaalaa.com has the CBSE, Karnataka Board PUC Mathematics Physics [English] Class 12 CBSE, Karnataka Board PUC solutions in a manner that help students grasp basic concepts better and faster. The detailed, step-by-step solutions will help you understand the concepts better and clarify any confusion. NCERT solutions for Mathematics Physics [English] Class 12 CBSE, Karnataka Board PUC 4 (Moving Charges and Magnetism) include all questions with answers and detailed explanations. This will clear students' doubts about questions and improve their application skills while preparing for board exams.
Further, we at Shaalaa.com provide such solutions so students can prepare for written exams. NCERT textbook solutions can be a core help for self-study and provide excellent self-help guidance for students.
Concepts covered in Physics [English] Class 12 chapter 4 Moving Charges and Magnetism are Overview: Moving Charges and Magnetic Field, Overview: Torque on a Current-Loop : Moving-Coil Galvanometer, Motion in a Magnetic Field, Magnetic Field on the Axis of a Circular Current Loop, Circular Current Loop as a Magnetic Dipole, Torque on a Rectangular Current Loop in a Uniform Magnetic Field, The Magnetic Dipole Moment of a Revolving Electron, Moving Coil Galvanometer, Magnetic force, Biot-Savart Law, Ampere’s Circuital Law, Solenoid and the Toroid - the Solenoid, Force Between Two Parallel Currents, the Ampere, Solenoid and the Toroid - the Toroid, Magnetic Diapole, Oersted's Experiment, Sources and Fields of Magnetic Force, Magnetic Field, Lorentz Force, Force on a Current - Carrying Conductor in a Uniform Magnetic Field, Force on a Moving Charge in Uniform Magnetic and Electric Fields, Straight and Toroidal Solenoids (Only Qualitative Treatment), Velocity Selector, Cyclotron, Torque on a Current-Loop in a Uniform Magnetic Field, Force on a Current Carrying Conductor in a Magnetic Field, Overview: Moving Charges and Magnetic Field, Overview: Torque on a Current-Loop : Moving-Coil Galvanometer, Motion in a Magnetic Field, Magnetic Field on the Axis of a Circular Current Loop, Circular Current Loop as a Magnetic Dipole, Torque on a Rectangular Current Loop in a Uniform Magnetic Field, The Magnetic Dipole Moment of a Revolving Electron, Moving Coil Galvanometer, Magnetic force, Biot-Savart Law, Ampere’s Circuital Law, Solenoid and the Toroid - the Solenoid, Force Between Two Parallel Currents, the Ampere, Solenoid and the Toroid - the Toroid, Magnetic Diapole, Oersted's Experiment, Sources and Fields of Magnetic Force, Magnetic Field, Lorentz Force, Force on a Current - Carrying Conductor in a Uniform Magnetic Field, Force on a Moving Charge in Uniform Magnetic and Electric Fields, Straight and Toroidal Solenoids (Only Qualitative Treatment), Velocity Selector, Cyclotron, Torque on a Current-Loop in a Uniform Magnetic Field, Force on a Current Carrying Conductor in a Magnetic Field.
Using NCERT Physics [English] Class 12 solutions Moving Charges and Magnetism exercise by students is an easy way to prepare for the exams, as they involve solutions arranged chapter-wise and also page-wise. The questions involved in NCERT Solutions are essential questions that can be asked in the final exam. Maximum CBSE, Karnataka Board PUC Physics [English] Class 12 students prefer NCERT Textbook Solutions to score more in exams.
Get the free view of Chapter 4, Moving Charges and Magnetism Physics [English] Class 12 additional questions for Mathematics Physics [English] Class 12 CBSE, Karnataka Board PUC, and you can use Shaalaa.com to keep it handy for your exam preparation.
