Two insulated charged copper spheres A and B have their centers separated by a distance of 50 cm. What is the mutual force of electrostatic repulsion if the charge on each is ? The radii of A and B are negligible compared to the distance of separation.
1. 1.52 × 10−2 N
2. 3.7 × 10−2 N
3. 2.01 × 10−2 N
4. 2.23 × 10−1 N
The figure below shows tracks of three charged particles in a uniform electrostatic field. Which particle has the highest charge to the mass ratio?
1. 2
2. 3
3. 1
4. 1 and 3
What is the flux of electric field through a square of 10 cm on a side whose plane is parallel to the y z – plane?
1. \(15\ N\ m^{2}/C\)
2.\(10\ N\ m^{2}/C\)
3.\(30 \ N\ m^{2}/C\)
4.0
The electric field at the surface of a black box indicates that the net outward flux through the surface of the box is \(8.0\times10^{3}\) N-m2/C. What is the net charge inside the box?
1. \(1.01\) \(\mu\)C
2. \(0.01\) \(\mu\)C
3. \(0.03\) \(\mu\)C
4. \(0.07\) \(\mu\)C
A point charge + 10 μC is at a distance 5 cm directly above the centre of a square of side 10 cm, as shown in the figure. What is the magnitude of the electric flux through the square?
1.
2.
3.
4.
A point charge of 2.0 μC is at the center of a cubic Gaussian surface 9.0 cm on edge. What is the net electric flux through the surface?
1. 2.26 × 105 N m2 C-1
2. 2.09 × 105 N m2 C-1
3. 4.33 × 105 N m2 C-1
4. 4.71 × 105 N m2 C-1
A point charge causes an electric flux of to pass through a spherical Gaussian surface of 10.0 cm radius centered on the charge. If the radius of the Gaussian surface were doubled, how much flux would pass through the surface?
1. - 2.0×103 N m2/ C
2. - 1.0 ×103 N m2/ C
3. 2.0 ×103 N m2/ C
4. 0
A conducting sphere of radius \(10\) cm has an unknown charge. If the electric field, \(20\) cm from the centre of the sphere is \(1.5\times10^3\) N/C and points radially inward, what is the net charge on the sphere?
1. \(-5.70\) nC
2. \(-6.67\) nC
3. \(6.67\) nC
4. \(5.70\) nC
A uniformly charged conducting sphere of 2.4 m diameter has a surface charge density of . The charge on the sphere is:
1. 2 .077 × 10-3 C
2. 2. 453 × 10-3C
3. 1. 447 × 10-3C
4. 3. 461 × 10-3C
An infinite line charge produces a field of \(9\times10^{4}~\text{N/C}\) at a distance of \(2~\text{cm}\). The linear charge density is:
1. \(0.1~\mu\text{C/m}\)
2. \(100~\mu\text{C/m}\)
3. \(1.0~\mu\text{C/m}\)
4. \(10~\mu\text{C/m}\)