# Electrostatics (NEET Physics): Questions 77 - 80 of 107

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## Question number: 77

» Electrostatics » Electrostatic Potential Energy

### Question

Four charges + q, -q, + q and -q are put together on four corners of a square as shown in figure. The net electrostatic energy of the system is,

### Choices

Choice (4) | Response | |
---|---|---|

a. | Zero | |

b. |
| |

c. |
| |

d. | All of the above |

## Question number: 78

» Electrostatics » Electric Field Due to a Point Charge

### Question

Electric field at point P is given as

### Choices

Choice (4) | Response | |
---|---|---|

a. | r | |

b. | r | |

c. | r | |

d. | r |

## Question number: 79

» Electrostatics » Capacitors

### Assertion (Ꭺ)

If the distance between parallel plates of a capacitor is halved and dielectric constant is made three times, then the capacitance becomes 6 times.

### Reason (Ꭱ)

Capacity of the capacitor does not depend upon the nature of the material of plates.

### Choices

Choice (4) | Response | |
---|---|---|

a. | Both Ꭺ and Ꭱ are true but Ꭱ is NOT the correct explanation of Ꭺ | |

b. | Both Ꭺ and Ꭱ are false | |

c. | Ꭺ is false but Ꭱ is true | |

d. | Both Ꭺ and Ꭱ are true and Ꭱ is the correct explanation of Ꭺ |

## Question number: 80

» Electrostatics » Electric Potential

### Question

Identical point charges, each having *+q * charge, are fixed at each of the points *x = x* _{0}*, x = 3x* _{0}*, x = 5x* _{0} ……… infinite, on the x-axis and an identical point charges, each having *-q * charge, are fixed at each of the points *x = 2x* _{0}*, x = 4x* _{0}*, x = 6x* _{0} ……. infinite. Here x _{0} is a positive constant. Potential at the origin due to the above system of charges is,

### Choices

Choice (4) | Response | |
---|---|---|

a. |
| |

b. |
| |

c. |
| |

d. | 0 |