NEET2007PhysicsElectrostaticsActual
As per this diagram a point charge +q is placed at the origin O . Work done in taking another point charge -Q from the point A [coordinates (0, a)] to another point B[ coordinates (a, 0)] along the straight path A B is
Options
- AZERO
- B( -q Q 4 ₀ 1 a^2 ) 2 a
- C( q Q 4 ₀ 1 a^2 )
- D( q Q 4 ₀ 1 a^2 ) 2 a
Correct answer
A. ZERO
Step-by-step solution
The work done in carrying a test charge consists in product of difference of potentials at points A and B and value of test charge. Potential at A V_A= 1 4 ₀ q a Potential at B V_B= 1 4 ₀ q a Thus, work done in carrying a test charge -Q from A to BW= (V_A-V_B )(-Q)=0