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Andhra Pradesh SSC (Class 10) Effects of Electric Current — practice questions — page 3

Explore 71 free Effects of Electric Current questions in Andhra Pradesh SSC (Class 10) Science and Technology. Open each question or exercise to read its content, reference answers and available explanation.

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Effects of Electric Current questions and exercises with answers

Showing questions 61–71 of 71.

Two parallel wires carry currents in the SAME direction. They:Read the answer and worked solution →In a domestic three-wire system, which wire provides the safety connection to earth?Read the answer and worked solution →Which of the following is the working principle of an electric generator?Read the answer and worked solution →A straight conductor of length 0.5 m carries 2 A at right angles to a 0.4 T magnetic field. The force on it is:Read the answer and worked solution →Which device is essentially a generator producing AC?Read the answer and worked solution →In a DC motor, what role does the split-ring commutator play?Read the answer and worked solution →A fuse for a 10 A appliance should be rated approximately:Read the answer and worked solution →Match the rule to what it predicts (CBSE Cl 10 Magnetism)Read the answer and worked solution →Sort: AC or DC supply? (CBSE Cl 10)Read the answer and worked solution →True or false on magnetism (CBSE Cl 10)Read the answer and worked solution →Order the steps of motor operation (CBSE Cl 10)Read the answer and worked solution →

Worked practice questions

Two parallel wires carry currents in the SAME direction. They:

  1. Attract each other
  2. Repel each other
  3. Exert no force on each other
  4. Stop carrying current
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Correct answer: A. Attract each other

1. Each current-carrying wire creates a magnetic field around it. 2. The field of the first wire exerts a force on the second wire via the motor effect. 3. Using Fleming's left-hand rule with parallel co-directional currents, both wires feel inward forces. 4. So the two wires are pulled toward each other. 5. Hence parallel currents in the same direction attract. 6. Opposite currents would repel each other instead. _Source: syllabus Science Ch 13 'Magnetic Effects of Electric Current' (learncbse.in extract)_

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In a domestic three-wire system, which wire provides the safety connection to earth?

  1. Live wire (red)
  2. Earth wire (green)
  3. Neutral wire (black)
  4. Fuse wire (yellow)
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Correct answer: B. Earth wire (green)

1. Indian domestic supply uses three wires: live, neutral, and earth. 2. The live wire is at high potential; the neutral wire returns the current. 3. The earth wire is connected to the metal body of appliances. 4. If a fault makes the body live, current flows safely to earth. 5. The earth wire is colour-coded green in standard wiring. 6. So the green earth wire provides the safety connection. _Source: syllabus Science Ch 13 'Magnetic Effects of Electric Current' (learncbse.in extract)_

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Which of the following is the working principle of an electric generator?

  1. Coulomb's law of electrostatics
  2. Joule heating effect
  3. Electromagnetic induction
  4. Ohm's law
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Correct answer: C. Electromagnetic induction

1. A generator converts mechanical energy into electrical energy. 2. A coil rotates in a magnetic field, changing the flux through the coil. 3. The changing flux induces an EMF in the coil (Faraday's law). 4. This is the principle of electromagnetic induction. 5. So generators work on electromagnetic induction. 6. Ohm's law and Joule heating describe current behaviour, not generation. _Source: syllabus Science Ch 13 'Magnetic Effects of Electric Current' (learncbse.in extract)_

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