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Karnataka SSLC (Class 10) Magnetic Effects of Electric Current — practice questions

Explore 15 free Magnetic Effects of Electric Current questions in Karnataka SSLC (Class 10) Science. Open each question or exercise to read its content, reference answers and available explanation.

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Magnetic Effects of Electric Current questions and exercises with answers

Showing questions 1–15 of 15.

The scientist who first showed that an electric current produces a magnetic field wasRead the answer and worked solution →Magnetic field lines outside a bar magnet are directedRead the answer and worked solution →The direction of the magnetic field produced around a straight current-carrying conductor is given by theRead the answer and worked solution →A current-carrying solenoid behaves like aRead the answer and worked solution →The force on a current-carrying conductor placed in a magnetic field is found usingRead the answer and worked solution →An electric motor convertsRead the answer and worked solution →An electric generator works on the principle ofRead the answer and worked solution →The direction of the current induced in a conductor moving in a magnetic field is given byRead the answer and worked solution →In India, the alternating current supplied to homes changes its directionRead the answer and worked solution →In a household wiring, the wire that acts as a safety measure by connecting the metallic body of appliances to the earth is theRead the answer and worked solution →An electric fuse protects a circuit byRead the answer and worked solution →A short circuit occurs whenRead the answer and worked solution →Magnetic field lines are said to be crowded (closer together) where the magnetic field isRead the answer and worked solution →Overloading of a domestic circuit happens whenRead the answer and worked solution →Match each rule to what it givesRead the answer and worked solution →

Worked practice questions

The scientist who first showed that an electric current produces a magnetic field was

  1. Michael Faraday
  2. James Watt
  3. Hans Christian Oersted
  4. Georg Ohm
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Correct answer: C. Hans Christian Oersted

1. In 1820 a compass needle near a current-carrying wire was seen to deflect. 2. **Hans Christian Oersted** made this observation, linking electricity and magnetism. 3. Faraday later discovered electromagnetic induction (the reverse effect). _Source: Karnataka SSLC (KSEEB) Class 10 Science, Ch13 'Magnetic Effects of Electric Current', §13.1_

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Magnetic field lines outside a bar magnet are directed

  1. from south pole to north pole
  2. from both poles to the middle
  3. in no fixed direction
  4. from north pole to south pole
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Correct answer: D. from north pole to south pole

1. By convention field lines emerge from the north pole and enter the south pole outside the magnet. 2. So outside the magnet they run **from north to south** (and from S to N inside). 3. Field lines never cross one another. _Source: Karnataka SSLC (KSEEB) Class 10 Science, Ch13 'Magnetic Effects of Electric Current', §13.2_

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The direction of the magnetic field produced around a straight current-carrying conductor is given by the

  1. right-hand thumb rule
  2. Fleming's left-hand rule
  3. Fleming's right-hand rule
  4. Lenz's law
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Correct answer: A. right-hand thumb rule

1. The field around a straight wire forms concentric circles. 2. The **right-hand thumb rule** (thumb points along the current, fingers curl in the field direction) gives its direction. 3. Fleming's rules apply to force and induced current, not the field of a straight wire. _Source: Karnataka SSLC (KSEEB) Class 10 Science, Ch13 'Magnetic Effects of Electric Current', §13.2_

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