Vidaara.orgClass 10 · Physics
CodeVID-P10-04-MFC-01
Magnetic Field due to Electric Current — Assignment
Name: ____________________
Roll No.: __________
Date: ____________
General Instructions
- All questions are compulsory.
- Section A carries 1 mark each, Section B 2 marks, Section C 3 marks and Section D 5 marks.
- Draw neat labelled diagrams wherever asked. For full solutions, raise your doubts with your teacher.
Section A — Multiple Choice Questions
5 × 1 = 5 marks
1.
Magnetic field lines emerge from which pole outside a magnet?
- A.South
- B.North
- C.Both
- D.Neither
2.
Field lines of a straight wire are:
- A.straight
- B.concentric circles
- C.radial
- D.square
3.
Oersted linked electricity with:
- A.heat
- B.magnetism
- C.sound
- D.light
4.
A soft-iron core makes the field of a solenoid:
- A.weaker
- B.stronger
- C.zero
- D.unchanged
5.
Two field lines can:
- A.cross once
- B.never cross
- C.always cross
- D.merge anywhere
Section B — Short Answer (2 marks)
3 × 2 = 6 marks
6.
State the right-hand thumb rule.
7.
Why can a single magnetic pole not exist?
8.
How does the field of a straight wire change with distance?
Section C — Short Answer (3 marks)
2 × 3 = 6 marks
9.
List three properties of magnetic field lines.
10.
Explain how a solenoid acts as a bar magnet.
Section D — Long Answer (5 marks)
1 × 5 = 5 marks
11.
Describe Oersted's experiment and draw the field pattern around a straight current-carrying wire, marking current and field directions.
Answer Key
Section A — Multiple Choice Questions
- (B) North
- (B) concentric circles
- (B) magnetism
- (B) stronger
- (B) never cross
Section B — Short Answer (2 marks)
- Thumb along current, curled fingers give field direction.
- Breaking a magnet always gives pieces each having both N and S poles.
- It becomes weaker as distance from the wire increases.
Section C — Short Answer (3 marks)
- Run N to S outside, closer where field is strong, never cross.
- Uniform internal field; one end N, other S, like a bar magnet.
Section D — Long Answer (5 marks)
- Compass deflects near current wire; concentric circles, direction by right-hand thumb rule.
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