Chapter Exam

Chapter 10: Electromagnetism — Online MCQ Test

Q: Who discovered that a current-carrying conductor produces a magnetic field around it?

Answer: A. Hans Christian Oersted — Hans Christian Oersted's discovery in 1820 demonstrated the connection between electricity and magnetism by showing a compass needle deflects near a current-carrying wire.

Q: A solenoid with 500 turns carries current I. If the current is doubled, the magnetic field strength becomes:

Answer: C. Double the original value — Magnetic field in a solenoid is directly proportional to current (B ∝ nI); therefore, doubling the current doubles the magnetic field strength.

PHYSICAL SCIENCES · CLASS 10th · Telangana State Board

Practice Chapter 10: Electromagnetism with a free chapter-wise online MCQ test for Telangana State Board CLASS 10th PHYSICAL SCIENCES. This chapter covers: Exploring the connection between electricity and magnetism this chapter details Hans Christian Oersted's discovery of magnetic fields around current-carrying conductors. Students l.... AI-generated questions from basic to board-exam level, with instant results and explanations.

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Chapter 10: Electromagnetism — Important Questions & Answers (FAQ)

Frequently asked questions from Telangana State Board CLASS 10th PHYSICAL SCIENCES — Chapter 10: Electromagnetism, with answers and explanations. These are sample questions; the exam has its own separate question set.

Who discovered that a current-carrying conductor produces a magnetic field around it?

A. Hans Christian Oersted ✓
B. Michael Faraday
C. John Fleming
D. James Clerk Maxwell

Answer: A. Hans Christian Oersted
Hans Christian Oersted's discovery in 1820 demonstrated the connection between electricity and magnetism by showing a compass needle deflects near a current-carrying wire.

What is a solenoid?

A. A single loop of wire carrying current
B. A coil of wire wound in tight, successive loops carrying current ✓
C. A permanent magnet used in motors
D. A device that measures electric current

Answer: B. A coil of wire wound in tight, successive loops carrying current
A solenoid is a coil of insulated wire wound tightly in successive loops that produces a strong magnetic field when current flows through it.

Which of the following statements about Faraday's Law is correct?

A. A changing magnetic field produces a constant electric field
B. A changing magnetic flux through a coil induces an electromotive force (EMF) ✓
C. A static magnetic field always induces current in any conductor
D. Induced EMF depends only on the number of turns in the coil

Answer: B. A changing magnetic flux through a coil induces an electromotive force (EMF)
Faraday's Law of Electromagnetic Induction states that a change in magnetic flux through a coil induces an EMF, which is the fundamental principle behind generators.

A solenoid with 500 turns carries current I. If the current is doubled, the magnetic field strength becomes:

A. Half of the original value
B. Same as the original value
C. Double the original value ✓
D. Four times the original value

Answer: C. Double the original value
Magnetic field in a solenoid is directly proportional to current (B ∝ nI); therefore, doubling the current doubles the magnetic field strength.

Consider a scenario: A copper wire coil is placed near a solenoid carrying AC current. According to Lenz's Law, the induced current in the coil will:

A. Always flow in the same direction as the solenoid's current
B. Flow in a direction to oppose the change in magnetic flux from the solenoid ✓
C. Not flow because copper is not ferromagnetic
D. Flow only when the solenoid current reaches its maximum value

Answer: B. Flow in a direction to oppose the change in magnetic flux from the solenoid
Lenz's Law states that induced current opposes the change in magnetic flux that caused it; as AC current in the solenoid changes, the induced current in the coil creates a field opposing this change.