Tag: charging and discharging

Questions Related to charging and discharging

Electric switches and appliances should be tested only with 

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

  1. Right hand

  2. Left hand

  3. Both hands

  4. Electric tester

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Correct Option: D
Explanation:

We should not touch the electric appliance with bare hands. To check the supply in the circuit, the electric tester should be used.

Lightning is a ________ phenomenon

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

  1. Electromagnetic

  2. Current electricity

  3. Electrochemical

  4. Electrostatic

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Correct Option: D
Explanation:

Lightning is a sudden electrostatic discharge during an electrical storm between electrically charged regions of a cloud, between that cloud and another cloud, or between a cloud and the ground.

Sometimes you get a mild spark when you touch the metal surface of a car. What might be the reason?

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

  1. Due to magnetic attraction, a spark is created

  2. Due to electrostatic charge residing on the metal as well as on skin, mild spark is observed

  3. Car tries to become neutral by donating electrons

  4. Its the only path to ground

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Correct Option: B
Explanation:

Negative electric charge often resides on the surface of metal of car. When you touch the car, electrostatic discharge occurs via your body and you get a mild spark.

Which is not an electrostatic phenomenon

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

  1. Comb rubbed with hair attracts paper bits

  2. A blanket in winters in dark when scrambled gives electrical sparks

  3. Two people shaking hands feel a small spark in winters

  4. Heat is generated in a resistor carrying current

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Correct Option: D
Explanation:

(d) is based on Joule's Law.

Rest are electrostatic phenomenon.

.......... Property develops in comb due to friction.

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

  1. Attractive

  2. Repulsive

  3. Both

  4. None

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Correct Option: A
Explanation:

An attractive property is develop in the comb due to friction. The comb on rubbing over dry hairs is aid to be charged.

......... Charge is produced by friction

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

  1. Stationary

  2. No

  3. Attractive

  4. All

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Correct Option: A
Explanation:

The stationary charge (i.e static electricity) is produced by friction.

If a glass rod is rubbed on silk cloth and then brought near the bits of paper it...... then.

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

  1. Attracts

  2. Repel

  3. Both

  4. None

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Correct Option: A
Explanation:

If a ordinary glass rod is rubbed on the silk cloth is brought near bits of paper, it is found that they have acquired the attractive property. The glass rod get charged on rubbing.

What is known as electrostatic attraction?

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

  1. When negatively charged atom is attracted towards positively charged atom

  2. When positively charged atom is attracted towards negatively charged atom

  3. When positively charged atom is attracted towards positively charged atom

  4. When negatively charged atom is attracted towards negatively charged atom

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Correct Option: A
Explanation:

When negatively charged atom is attracted towards positively charged atom, it is known as electrostatic attraction.


Option A is correct.

What is known as electrostatic repulsion?

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

  1. When two positively or two negatively charged electrons come closer to each other then they repel from each other

  2. When two charged electrons come closer to each other then they repel from each other

  3. When positively and negatively charged electrons come closer to each other then they repel from each other

  4. None

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Correct Option: A
Explanation:

When two positively or two negatively charged electrons come closer to each other then they repel from each other. Then it is known as electrostatic repulsion.


Option A is correct.

The law that describes the force as directly proportional to magnitude of charges and inversely proportional to the distance between the charges is known as :

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

  1. Newton's law

  2. Coulomb's law

  3. Gauss's law

  4. Ohm's law

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Correct Option: B
Explanation:

Newton's law : force $F=ma$  where m=mass and a=acceleration

Coulomb's law : force $F=\dfrac{kq _1q _2}{r^2}$ where $q _1, q _2 $ are charges and $r=$ separation of charges and $k=$ proportionality constant.
Gauss's law : the electric flux $\phi=\dfrac{q}{\epsilon _0}$ 
Ohm's law : Potential across a wire of resistance R is $V=IR$ where I is the current.