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Home > NCERT Solutions > Class 12 > Physics > Physics Part I > Chapter 4 Moving Charges And Magnetism

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

Moving Charges And Magnetism Here is the CBSE Physics 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 Physics Moving Charges And Magnetism Chapter 4 NCERT Solutions for Class 12 Physics 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 Physics.

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

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

Question 2

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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?

Easy

Question 3

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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.

Easy

Question 4

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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?

Easy

Question 5

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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?

Easy

Question 6

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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.

Easy

Question 7

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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.

Easy

Question 8

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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?

Easy

Question 9

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Two moving coil meters, M₁ and M₂ have the following particulars:
R₁ = 10 Ω N₁ = 30,
A₁ = 3.6 x 10^–3 m², B₁ = 0.25 T
R₂ = 14 Ω; N₂ = 42,
A₂ = 1.8 x 10^–3 m², B₂ = 0.50 T
(The spring constants k are identical for the two meters).
Determine the ratio of (a) current sensitivity and (b) voltage sensitivity of M₂ and M_1.

Average

Question 10

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In a chamber, a uniform magnetic field of 6.5 G (1 G = 10^–4T) is maintained. An electron is shot into the field with a speed of 4.8 x 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 = 1.6 x 10^–31 C, m_e = 9.1 x 10^–31 kg)

Average

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