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Class 12 Question Answers — Physics — Electric Charges and Fields

What is electric potential?

Electric potential at a point in an electric field is the amount of work done in bringing a unit positive charge from infinity to the point.   (i) Electric potential is a scalar quantity.(ii) S.I. unit: Volt(V).  (ii...

Class 12 Subject: Physics Topic: Electric Charges and Fields
A spherical conductor of radius 12 cm has a charge of 1.6 x10^-7 C distributed uniformly on its surface. What is the electric field, a) inside the sphere?

It is provided that,Spherical conductor’s radius, r =12cm =0.12 m The charge is evenly distributed across the conductor. The electric field within a spherical conductor is zero because the total net charge within...

Class 12 Subject: Physics Topic: Electric Charges and Fields
What is the direction of the electric field at every point on this surface?

The electric field's direction is perpendicular to the plane in the line AB direction at every location on this surface .

Class 12 Subject: Physics Topic: Electric Charges and Fields
An electrostatic field line is a continuous curve. That is, a field line cannot have sudden breaks. Why not?

An electrostatic field line is a continuous curve as the charge experiences a continuous force on being placed in an electric field.  As the charge doesn’t jump from one point to the other, field lines will not hav...

Class 12 Subject: Physics Topic: Electric Charges and Fields
When a glass rod is rubbed with a silk cloth, charges appear on both. A similar phenomenon is observed with many other pairs of bodies. Explain how this observa...

Rubbing two objects would produce charges that are equal in magnitude and opposite in nature on the two bodies. This happens due to the reason that charges are created in pairs. This phenomenon is called charging by fr...

Class 12 Subject: Physics Topic: Electric Charges and Fields
Why can one ignore quantization of electric charge when dealing with macroscopic i.e., large scale charges?

On a macroscopic scale or large-scale, the number of charges is as large as the magnitude of an electric charge.  So, quantization is considered insignificant at a macroscopic scale for an electric charge and electr...

Class 12 Subject: Physics Topic: Electric Charges and Fields
What is the force on the second sphere due to the first?

From Newton’s third law of motion, we know that every action has an equal and opposite reaction. Thus, we could say that the given two spheres would attract each other with the same force.  So, the force on the...

Class 12 Subject: Physics Topic: Electric Charges and Fields
Subject Wise Question Answers Class 12

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