12th class physics /Electric charges and field

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12th class physics short questions from chapter

Electric charges and field 

Chapter One

ELECTRIC CHARGES

AND FIELDS

1.1 INTRODUCTION

Question 1

Define electrostatic?

Ans:-

Electrostatics deals with

the study of forces, fields and potentials arising from

static charges.

Question 2

Who coined the term electricity? 

Ans:-

The name electricity is coined from the Greek word

elektron meaning amber.

Question 3 

Meaning of polarity of charges 

Ans:-

 The property which differentiates the two kinds of charges is called

the polarity of charge.

Question 4

Who gave the name positive and negative charges? 

Ans:-

The charges were named

as positive and negative by the American scientist Benjamin Franklin.

Question 5

Gain of electrons means 

Ans:- negative charge 

Question 6

loss of electrons means

Ans:-  positive charge

Question 7

Use of golden leaf electroscope 

Ans:-

A simple apparatus to detect charge on a body is the gold-leaf electroscope

Question 8

What are conductor?

Ans:-

Those which allow electricity to pass through them easily are called conductors.

Question 9

What are insulators? 

Ans:- 

Most of the non-metals like glass, porcelain, plastic, nylon, wood offer high resistance to the passage of

electricity through them. They are called insulators.

Question 10

Charge on 1electron

Ans:- e = 1.602192 × 10–19 

 Question 11

Number of electrons containing In 1 coulomb of charge

Ans:-

There are about 6 × 10^18 electrons in a charge of  1C

Question 12

Principal of superposition

Ans:- , it is verified that force on any charge due to a number of other charges is the vector sum of all the forces This is termed as the principle of superposition.

Question 13

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