Magnetic Effects of Electric Current

What you'll learn

A Class 10 explainer on how current creates magnetism, magnetic field lines, the right-hand thumb rule, Fleming's rules, electric motors, electromagnetic induction, generators and safe domestic wiring.

This chapter has

Magnetic Effects of Electric Current — solved practice questions

8 Class 10 Science questions with step-by-step solutions. Attempt each, then reveal the answer.

1. Q1easy

   A magnetic field is created around a conductor whenever:

   • Ait is heated
   • Belectric current flows through it
   • Cit is magnetised
   • Dit is placed near a magnet
   Show answer & solution

   Correct answer: (B) electric current flows through it

   An electric current flowing through a conductor creates a magnetic field around it (Oersted's discovery).

2. Q2medium

   The rule used to find the direction of the magnetic field around a straight current-carrying conductor is:

   • Aright-hand thumb rule
   • BFleming's left-hand rule
   • CFleming's right-hand rule
   • DLenz's law
   Show answer & solution

   Correct answer: (A) right-hand thumb rule

   The right-hand thumb rule: hold the conductor with the right hand, thumb pointing in the direction of current; fingers curl in the direction of field.

3. Q3easy

   A solenoid carrying current acts like a:

   • Acapacitor
   • Bbar magnet
   • Celectric motor
   • Dgenerator
   Show answer & solution

   Correct answer: (B) bar magnet

   A solenoid (coil of wire carrying current) behaves like a bar magnet, with north and south poles.

4. Q4medium

   Fleming's left-hand rule is used to find the direction of:

   • Aforce on a current-carrying conductor
   • Binduced EMF
   • Cmagnetic field direction
   • Dcurrent direction
   Show answer & solution

   Correct answer: (A) force on a current-carrying conductor

   Fleming's left-hand rule gives the direction of the force on a current-carrying conductor in a magnetic field (used in motors).

5. Q5easy

   An electric motor converts:

   • Aelectrical energy to mechanical energy
   • Bmechanical energy to electrical energy
   • Cheat to electrical energy
   • Dlight to electrical energy
   Show answer & solution

   Correct answer: (A) electrical energy to mechanical energy

   An electric motor converts electrical energy into mechanical energy.

6. Q6easy

   An electric generator converts:

   • Aelectrical energy to mechanical energy
   • Bmechanical energy to electrical energy
   • Cheat to light
   • Dchemical energy to electrical energy
   Show answer & solution

   Correct answer: (B) mechanical energy to electrical energy

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

7. Q7medium

   Electromagnetic induction is the phenomenon of:

   • Acreating magnetic field from current
   • Binducing current by changing magnetic flux
   • Cstoring charge in a capacitor
   • Dconverting AC to DC
   Show answer & solution

   Correct answer: (B) inducing current by changing magnetic flux

   Electromagnetic induction — a changing magnetic flux through a coil induces an EMF (Faraday's law).

8. Q8medium

   The direction of induced current is given by:

   • AOhm's law
   • BFleming's left-hand rule
   • CLenz's law / Fleming's right-hand rule
   • Dright-hand thumb rule
   Show answer & solution

   Correct answer: (C) Lenz's law / Fleming's right-hand rule

   Lenz's law gives the direction: the induced current opposes the change in magnetic flux that causes it.

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