Magnetic Effects of Electric Current (Class 10 Science)

Electric current produces magnetic fields, and these magnetic effects have numerous practical applications. Understanding magnetism helps us use electric d

Magnetic Effects of Electric Current (Class 10 Science)

Electric current produces magnetic fields, and these magnetic effects have numerous practical applications. Understanding magnetism helps us use electric d

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TL;DR: Electric current produces magnetic fields, and these magnetic effects have numerous practical applications. Understanding magnetism helps us use elect…

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Electric current produces magnetic fields, and these magnetic effects have numerous practical applications. Understanding magnetism helps us use electric d

Magnetic Effects of Electric Current MCQs with Answers & Explanations

Q1. Which scientist demonstrated the magnetic effect of electric current?

  1. Faraday
  2. Ampere
  3. Oersted ✓ (correct)
  4. Coulomb

Explanation: Hans Christian Oersted discovered that an electric current flowing through a wire produces a magnetic field around it.

Q2. What is a solenoid?

  1. A straight wire
  2. A magnet
  3. A coil with two terminals
  4. A long coil of wire with many turns ✓ (correct)

Explanation: A solenoid is a long coil of insulated wire wound in tightly packed, uniform turns that acts like a magnetic dipole.

Q3. What is the direction of magnetic field around a current-carrying wire according to the right-hand rule?

  1. Circular around the wire ✓ (correct)
  2. Downward only
  3. Along the wire
  4. Perpendicular to the wire

Explanation: The right-hand rule states that if you curl your fingers in the direction of the magnetic field, the thumb points in the direction of current.

Q4. What is an electromagnet?

  1. A permanent magnet
  2. A magnet made by passing electric current through a coil ✓ (correct)
  3. A magnet without poles
  4. A magnet found in nature

Explanation: An electromagnet is created by passing electric current through a coil of wire, making it magnetic only when current flows.

Q5. Which device uses electromagnetic induction to produce electric current?

  1. Motor
  2. Solenoid
  3. Generator ✓ (correct)
  4. Transformer

Explanation: A generator converts mechanical energy into electrical energy using electromagnetic induction.

Q6. What is Faraday's law of electromagnetic induction?

  1. Resistance is constant
  2. Force is proportional to current
  3. Current is proportional to voltage
  4. Induced EMF is proportional to rate of change of magnetic flux ✓ (correct)

Explanation: Faraday's law states that the induced electromotive force (EMF) in a circuit is proportional to the rate of change of magnetic flux.

Q7. What is Lenz's law?

  1. Induced current opposes the change that causes it ✓ (correct)
  2. Power is constant
  3. Voltage is constant
  4. Current follows Ohm's law

Explanation: Lenz's law states that the direction of induced current is such that it opposes the change in magnetic flux causing it.

Q8. What is the function of a transformer?

  1. Store electrical energy
  2. Change voltage and current of AC ✓ (correct)
  3. Convert AC to DC
  4. Produce light

Explanation: A transformer changes the voltage and current of alternating current in a circuit using electromagnetic induction.

Q9. In a DC motor, what is the function of the split ring commutator?

  1. Increase voltage
  2. Reduce friction
  3. Reverse current direction periodically ✓ (correct)
  4. Produce magnetic field

Explanation: The commutator reverses the current direction in the coil every half rotation, ensuring continuous rotation in the same direction.

Q10. What is the unit of magnetic flux?

  1. Volt
  2. Tesla
  3. Ampere
  4. Weber ✓ (correct)

Explanation: The weber (Wb) is the SI unit of magnetic flux, equivalent to tesla-square meter.

Frequently Asked Questions

How does a DC motor work?

A DC motor works by passing current through a coil in a magnetic field. The magnetic force on current-carrying conductors produces a torque, causing the coil to rotate. The commutator reverses current direction periodically to maintain continuous rotation.

What is the difference between a motor and a generator?

A motor converts electrical energy to mechanical energy by using electromagnetic force. A generator converts mechanical energy to electrical energy using electromagnetic induction. They have opposite functions.

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