Test: Equipotential Surfaces Potential Energy of System of Charges (November 18) - NEET MCQ

# Test: Equipotential Surfaces Potential Energy of System of Charges (November 18) - NEET MCQ

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Test: Equipotential Surfaces Potential Energy of System of Charges (November 18) - Question 1

### For any charge configuration, equipotential surface through a point is _____to the electric field at that point.

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Definition based

Test: Equipotential Surfaces Potential Energy of System of Charges (November 18) - Question 2

### Optical analogue of an equipotential surface is

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Definition based

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Test: Equipotential Surfaces Potential Energy of System of Charges (November 18) - Question 3

### Equipotential surfaces cannot

Detailed Solution for Test: Equipotential Surfaces Potential Energy of System of Charges (November 18) - Question 3

The electric field lines are perpendicular to the equipotential surface. The field lines can not intersect each other because the electric force can not have two directions at a point.

Test: Equipotential Surfaces Potential Energy of System of Charges (November 18) - Question 4

When a positive charge is moved in an electrostatic field from a point at high potential to a low potential, its kinetic energy

Detailed Solution for Test: Equipotential Surfaces Potential Energy of System of Charges (November 18) - Question 4

We can generalise it by assuming a positive charge moving away from another positive charge. now both of them are repelling each other with some force. so that positive charge will accelerate which results in the increase in K.E.

Test: Equipotential Surfaces Potential Energy of System of Charges (November 18) - Question 5

Shape of equipotential surfaces for a uniform electric field along x-axis are

Detailed Solution for Test: Equipotential Surfaces Potential Energy of System of Charges (November 18) - Question 5

Shape of equipotential surfaces for a uniform electric field along x-axis are Planes normal to the field.

Test: Equipotential Surfaces Potential Energy of System of Charges (November 18) - Question 6

The amount of work done in moving a unit positive charge through distance of 10 cm on an equipotential surface is

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Definition based

Test: Equipotential Surfaces Potential Energy of System of Charges (November 18) - Question 7

Figure shows the field lines of a positive point charge. The work done by the field in moving a small positive charge from Q to P is

Detailed Solution for Test: Equipotential Surfaces Potential Energy of System of Charges (November 18) - Question 7

In moving a small positive charge from Q to P, work has to be done by an external agency against the electric field. Therefore, work done by the field is negative.

Test: Equipotential Surfaces Potential Energy of System of Charges (November 18) - Question 8

Two tiny spheres carrying charges 1.8 μC and 2.8μC are located at 40 cm apart. The potential at the mid-point of the line joining the two charges is

Detailed Solution for Test: Equipotential Surfaces Potential Energy of System of Charges (November 18) - Question 8

Here q1 = 1.8 μC = 1.8 × 10−6 C, q2 = 2.8 μC = 2.8 × 10−6C

Distance between the two spheres = 40 cm = 0.4 m
For the mid-point r1 = r2 = 0.40/2 = 0.2 m Potential at O,

Test: Equipotential Surfaces Potential Energy of System of Charges (November 18) - Question 9

In the question number 18, the potential at a point 20cm from the mid-point of the line joining the two charges in a plane normal to the line and passing through the mid-point is

Detailed Solution for Test: Equipotential Surfaces Potential Energy of System of Charges (November 18) - Question 9

From the figure, potential at P,

Test: Equipotential Surfaces Potential Energy of System of Charges (November 18) - Question 10

Four equal charges q each are placed at four corners of a square of side a each. Work done in carrying a charge −q from its centre to infinity is

Detailed Solution for Test: Equipotential Surfaces Potential Energy of System of Charges (November 18) - Question 10

Potential at centre O of the square

Work done in shifiting (−Q) charge from centre to infinity

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