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In charging a battery for motor car, following effect of electric current is used.
1. Magnetic
2. Heating
3. Chemical
4. Induction

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Correct Answer - Option 3 : Chemical

CONCEPT:

  • Chemical Effect of Electric Current:  An electric current when passed through an ionic solution can cause chemical reactions. This effect of current is called the chemical effects of Electric current. 
  • Car battery: A car battery stores electrical energy in form of chemical energy and utilizes it as per requirement. 
  • Charging a Car battery: To charge a car battery, the positive terminal of the source is connected to the positive terminal of the battery, and the negative terminal of the source is connected to the negative terminal of the battery. 
    • For charging the supplied voltage should be greater than the voltage across the car battery. 
    • The charging process is monitored as overcharging may damage the battery. 

EXPLANATION:

  • From the above concept, it is clear that an electric current is used to charge the battery and the electrical energy is stored in the battery in form of chemical energy.
  • So, the chemical effect of the current is used to charge the battery.

  • Magnetic Effect of Current: An electric current has a magnetic effect which is used to make electromagnets. 
  • Heating Effect of Current: The heat energy generated  due to current in resistors is called the heating effect of current. Appliances like heater used this effect.
  • Induction: The process by which electric current is induced due to a change in a magnetic field is called electromagnetic induction.

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