NCERT Solutions for Class 12 Help.html Physics Part I Chapter 4 Moving Charges And Magnetism

Moving Charges And Magnetism Here is the CBSE Help.html Chapter 4 for Class 12 students. Summary and detailed explanation of the lesson, including the definitions of difficult words. All of the exercises and questions and answers from the lesson's back end have been completed. NCERT Solutions for Class 12 Help.html Moving Charges And Magnetism Chapter 4 NCERT Solutions for Class 12 Help.html Moving Charges And Magnetism Chapter 4 The following is a summary in Hindi and English for the academic year 2025-26. You can save these solutions to your computer or use the Class 12 Help.html.

Question 1

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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?

Solution

Given,
Current carried by wire, I = 0.40 A,
Radius of circular wire, r = 8.0 cm = $8 \times 10^{- 2} m$
Number of turns in the coil, $n = 100$

Using the formula, we get the magnetic field at the centre of coil as

$B = \frac{μ_{0} nI}{2 r} = \frac{4 π \times 10^{- 7} \times 100 \times 0.4}{2 \times 8.0 \times 10^{- 2}} T$
$= 3.1 \times 10^{- 4} T .$

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NCERT Solutions for Class 12 Help.html Physics Part I Chapter 4 Moving Charges And Magnetism

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?

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.

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