Tag: properties of charge

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Multiple choice physics static electricity properties of charges charge properties of charge

The conservation of electric charge implies that

  1. charge cannot be created

  2. charge cannot be destroyed

  3. the number of charged particles in the universe is constant

  4. simultaneous creation of equal and opposite charges is permissible
Reveal answer Fill a bubble to check yourself
A,B,C Correct answer
Explanation

A, B and C are correct. 

A substance is neutral due to the presence of equal magnitude of positive and negative charge on it.
Although D is possible in radioactivity and its reactions, it is not related to the statement of the question

Multiple choice physics static electricity properties of charges charge properties of charge

The number of electrons for one coulomb of charge are:

  1. $\displaystyle 6.25\times { 10 }^{ 23 }$
  2. $\displaystyle 6.25\times { 10 }^{ 21 }$
  3. $\displaystyle 6.25\times { 10 }^{ 18 }$
  4. $\displaystyle 6.25\times { 10 }^{ 19 }$
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

1 electron carries a charge of $1.6 \times 10^{-19}$ coulomb 

So, No.of electron in one coulomb
$\dfrac{1}{1.6 \times 10^{-19}} = \dfrac{10^{19}}{1.6} = 6.25 \times 10^{18}$

Multiple choice physics static electricity properties of charges charge properties of charge

How many electrons make up a charge of $\displaystyle 20\mu C$ ?

  1. $\displaystyle 1.25\times { 10 }^{ 14 }$
  2. $\displaystyle 2.23\times { 10 }^{ 14 }$
  3. $\displaystyle 3.25\times { 10 }^{ 14 }$
  4. $\displaystyle 5.25\times { 10 }^{ 14 }$
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Charge on an electron $= 1.6 \times 10^{-19}$coulomb

no of electrons required $ = \dfrac{20 \times 10^{-6}}{1.6 \times 10^{-19}} = 1.25 \times 10^{14}$

Multiple choice physics static electricity properties of charges charge properties of charge

When resistance element of a heater fuses and then we reconnect it after removing a portion of it, the power of the heater will :

  1. decrease

  2. increase

  3. remain constant

  4. none
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

When ressitance element of a heater fuses and then we reconnect it after removing a portion of it, the power of the heater will increases because the resistance of wire decreases due to decrease in length of it. 


Option B is correct.

Multiple choice physics static electricity properties of charges charge properties of charge


When electric current passes through a bucket full of water , lot of bubbling is observed. This suggests that the type of supply is

  1. AC

  2. DC

  3. any of the above two

  4. None of the above
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

When a dc current is passed through water, the electrolysis of water molecules $(H _{2}O)$ takes place i.e, water gets split into hydrogen and oxygen gases. The bubbles are these gases escaping.