Tag: electric fields

Questions Related to electric fields

State whether true or false:

Unlike charges attract each other.

physics electric fields introduction to electrostatic force electric force charging and discharging

  1. True

  2. False

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Correct Option: A
Explanation:

Answer is A.

When two like charges are brought closer, they repel and when two unlike charges are brought closer, they attract each other.
Hence, unlike charges attaract each other and the statement is true.

What happens when some charge is placed on a soap bubble?

physics electric fields introduction to electrostatic force electric force charging and discharging

  1. Its radius decreases

  2. Its radius increases

  3. The bubble collapses

  4. None of these

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Correct Option: B
Explanation:

The radius of soap bublle increases because of outward force acting on the bubble due to charging

What do you understand by the static or frictional electricity ?

physics electric fields introduction to electrostatic force electric force charging and discharging

  1. Discarging of two bodies on rubbing them together is called static or frictional electricity.

  2. Charging of two bodies on rubbing them together is called static or frictional electricity.

  3. Electricity which is static is called static or frictional electricity.

  4. Electricity on high friction bodies is called static or frictional electricity.

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Correct Option: B
Explanation:

Static electricity is produced when a suitable combination of substances (e.g., glass rod and silk, ebonite rod and cat's skin, sealing wax and wool) are rubbed together and get electrified due to friction.

A negatively charged ebonite rod is brought near the glass rod which has been robbed on silk. State your observation between them

physics electric fields introduction to electrostatic force electric force charging and discharging

  1. Attraction

  2. Repulsion

  3. No change

  4. cant say

Show answer
Correct Option: A
Explanation:

Rubbing the glass rod with the silk makes it lose electrons, so glass rod becomes positively charged. When a negatively charged ebonite rod is brought near the glass rod it attract each other as unlike charges attract each other.