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Class 12 Moving Charges and Magnetism worksheet
CBSE Physics. Magnetic force, circular motion, Biot–Savart and Ampere fields, torque on a coil, ammeters and voltmeters. Every sheet has 20 questions in three sections and an answer key, and the numbers change every time.
Sample questions
Real questions from this chapter, as the app sets them. Tap Answer to see the answer and working.
Section A · multiple choice
- 1.
A proton moves at 2 × 10⁶ m/s at 150° to a magnetic field of 6 × 10⁻¹ T. The force on it is: (e = 1.6 × 10⁻¹⁹ C)
- 9.6 × 10⁻¹⁵ N
- 1.92 × 10⁻¹³ N
- 0 N
- 9.6 × 10⁻¹⁴ N
Answer
(d) 9.6 × 10⁻¹⁴ N
F = qvB sin θ = 1.6 × 10⁻¹⁹ × 2 × 10⁶ × 6 × 10⁻¹ × sin 150°
- 2.
A circular coil of 74 turns and radius 16 cm carries 9 A. The field at its centre is: (μ₀ = 4π × 10⁻⁷ T m/A)
- 4.1625π × 10⁻⁴ T
- 8.325π × 10⁻⁶ T
- 8.325π × 10⁻⁴ T
- 8.325 × 10⁻⁴ T
Answer
(c) 8.325π × 10⁻⁴ T
B = μ₀NI/(2R)
- 3.
The magnetic field 3 cm from a long straight wire carrying 20 A is: (μ₀ = 4π × 10⁻⁷ T m/A)
- 1.33 × 10⁻⁶ T
- 6.67 × 10⁻⁵ T
- 1.33π × 10⁻⁴ T
- 1.33 × 10⁻⁴ T
Answer
(d) 1.33 × 10⁻⁴ T
B = μ₀I/(2πr) = 2 × 10⁻⁷ I/r
Section B · short answer
- 4.
A circular coil of radius 19 cm has 12 turns and carries 7 A. Find the field at its centre. (μ₀ = 4π × 10⁻⁷ T m/A)
Answer
8.84π × 10⁻⁵ T
B = μ₀NI/(2R) = 4π × 10⁻⁷ × 12 × 7 ÷ (2 × 19 × 10⁻²)
- 5.
A wire 8 cm long carrying 16 A lies at 90° to a uniform field of 9 × 10⁻¹ T. Find the force on it.
Answer
1.152 N
F = BIL sin θ = 9 × 10⁻¹ × 16 × 8 × 10⁻² × sin 90°
Section C · long answer
- 6.
A galvanometer has resistance 40 Ω and full-scale current 2 mA. Show how to convert it into (a) an ammeter of range 0–8 A, (b) a voltmeter of range 0–440 V, and find the resistance of each meter.
Answer
(a) shunt 0.01 Ω in parallel; ammeter resistance 0.01 Ω; (b) 219,960 Ω in series; voltmeter resistance 220,000 Ω
S = I_gG/(I − I_g); R = V/I_g − G
Fresh sheets for your child
In the app, every Moving Charges and Magnetism sheet is new: the app remembers the questions your child has already had and leaves them out. Print the sheet as a PDF, or use notebook mode and write the answers in a notebook.
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