Test: Potential due to a System of Charges (NCERT) - NEET MCQ

# Test: Potential due to a System of Charges (NCERT) - NEET MCQ

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## 5 Questions MCQ Test NCERTs at Fingertips: Textbooks, Tests & Solutions - Test: Potential due to a System of Charges (NCERT)

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Test: Potential due to a System of Charges (NCERT) - Question 1

### 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: Potential due to a System of Charges (NCERT) - Question 1

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: Potential due to a System of Charges (NCERT) - Question 2

### Figure shows the field lines of a point negative charge. In going from B to A, the kinetic energy of a small negative charge will

Detailed Solution for Test: Potential due to a System of Charges (NCERT) - Question 2

Due to force of repulsion on the negative charge, velocity decreases and hence the kinetic energy decreases in going from B to A.

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Test: Potential due to a System of Charges (NCERT) - Question 3

### 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: Potential due to a System of Charges (NCERT) - Question 3

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: Potential due to a System of Charges (NCERT) - Question 4

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: Potential due to a System of Charges (NCERT) - Question 4

From the figure, potential at P,

Test: Potential due to a System of Charges (NCERT) - Question 5

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: Potential due to a System of Charges (NCERT) - Question 5

Potential at centre O of the square

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

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