The magnetic field inside a long solenoid is uniform and the direction around a straight current-carrying conductor comes from the right hand thumb rule, so this Class 10 sheet opens with the solenoid's field and its direction rule. An electric motor answer and a fuse follow in the key.
Key Takeaways
The field inside a long solenoid is uniform (Q1).
The right hand thumb rule gives direction around a straight wire (Q2).
Q6 records a fuse among the answers.
Section A: Multiple Choice Questions (1 Mark Each)
Choose the correct option for each question.
1.The magnetic field inside a long solenoid is
(a) zero(b) uniform(c) non-uniform(d) maximum at the centre only
2.The direction of the magnetic field produced by a straight current-carrying conductor is given by
(a) Fleming's left hand rule(b) the right hand thumb rule(c) Fleming's right hand rule(d) Lenz's law
3.A current-carrying conductor placed in a magnetic field experiences a force. This principle is the basis of the
(a) electric motor(b) electric generator(c) electric heater(d) electric fuse
4.The production of an electric current in a coil due to a changing magnetic field is called
(a) electrical energy into mechanical energy(b) mechanical energy into electrical energy(c) chemical energy into electrical energy(d) heat energy into electrical energy
6.The safety device that melts and breaks the circuit when the current exceeds a safe value is
(a) a switch(b) a fuse(c) a voltmeter(d) a battery
Section B: Short Answer Type Questions (2 Marks Each)
Show all steps clearly.
7.State the right hand thumb rule.
8.What is an electromagnet? Name one factor on which its strength depends.
9.State Fleming's left hand rule.
10.State Fleming's right hand rule.
11.What is electromagnetic induction? Who discovered it?
12.What is the function of an electric fuse?
13.Distinguish between alternating current (AC) and direct current (DC).
14.Why does a current-carrying solenoid behave like a bar magnet?
Section C: Numericals & Word Problems (3 Marks Each)
Apply the concepts to solve the problems. Show all working.
15.A current of 2 A flows through a wire. If the charge on one electron is 1.6 × 10⁻¹⁹ C, find the number of electrons flowing through the wire per second. (Number = current ÷ charge on one electron)
16.A conductor of length 0.5 m carrying a current of 2 A is placed perpendicular to a magnetic field of strength 0.4 T. Find the force acting on the conductor. (F = BIL)
17.A wire of length 20 cm carrying a current of 3 A experiences a force of 0.12 N when placed perpendicular to a uniform magnetic field. Find the strength of the magnetic field. (B = F ÷ IL, convert cm to m)
18.The frequency of domestic alternating current in India is 50 Hz. Find its time period. (T = 1 ÷ f)
19.A current of 5 A flows through a wire. Find the charge passing through a cross-section of the wire in 1 minute. (Q = It)
20.The magnetic field inside a solenoid is given by B = μ₀nI, where μ₀ = 4π × 10⁻⁷ T m/A. A solenoid has 2000 turns per metre and carries a current of 3 A. Find the magnetic field inside the solenoid. (Use π = 3.14)
Answer Key
1. b) uniform
2. b) the right hand thumb rule
3. a) electric motor
4. a) electromagnetic induction
5. b) mechanical energy into electrical energy
6. b) a fuse
7. Refer to solution guide.
8. Refer to solution guide.
9. Refer to solution guide.
10. Refer to solution guide.
11. Refer to solution guide.
12. Refer to solution guide.
13. Refer to solution guide.
14. Refer to solution guide.
15. Refer to solution guide.
16. Refer to solution guide.
17. Refer to solution guide.
18. Refer to solution guide.
19. Refer to solution guide.
20. Refer to solution guide.
End of Worksheet
People Also Ask
What is the magnetic field inside a long solenoid?
Uniform, option (b) in this worksheet (Q1).
Which rule gives the field direction around a straight conductor?
The right hand thumb rule, option (b) in this worksheet (Q2).
What device works by the magnetic effect of current?
An electric motor, option (a) in this worksheet (Q3).
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