Two-point charges 2μC and 4μC are placed 2 cm apart. The ratio of the Coulomb’s force experienced by them is
(A) 1: 2
(B) 2: 1
(C) 1: 1
(D) 4: 1
(A) 1: 2
(B) 2: 1
(C) 1: 1
(D) 4: 1
(C) 1: 1
Two charges of 2uC and 5uC are placed 2.5 cm apart. The ratio of Coulomb's force experienced by them is
A charge q is placed at one corner of the cube. The electric flux passing through any one of its face is
When 2 × \(10^{11}\) electrons are removed from a neutral metal sphere, the charge on the sphere becomes:
(A) -16 nC
(B) 16 nC
(C) -32 nC
(D) 32nC
Two charges q and –3q are placed on x-axis separated by distance d. Where a third charge 2q should be placed such that it will not experience any force ?
Two point charges q1 and q2 are located at points (a, 0, 0) and (0, b, 0) respectively. Find the electric field due to both these charges at the point (0, 0, c).
Three charges each equal to 2 μC are placed at the corners of an equilateral triangle. If force between any two charges is 2F, then the net force on either will be:
A point charge +Q is placed in the vicinity of a conducting surface. Draw the electric field lines between the surface and the charge.
A Solid conducting sphere having a charge Q is surrounded by an uncharged concentric conducting spherical shell. Let the potential difference between the surface of the solid sphere and the outer of the shell be V. If the shell is given a charge -3Q the new potential difference between the same two surfaces is
1. 2V
2. V/2
3. V
4. -2V
The locus of all particles in a medium, vibrating in the same phase is called
(a) wavelet.
(b) fringe.
(c) wave front.
(d) None of these.
Three capacitors of 6μf each are connected across a triangle. What is the resultant capacitance across any side of the triangle.
1. 6 μf
2. 2 μf
3. 4 μf
4. 12μf
If the 8th bright fringe of light of wavelength \(λ_1\) coincides with the 9th bright fringe of light of the wavelength \(λ_2\) in young’s double experiment, then the possible wavelengths of visible light are
(A) 400nm and 450nm
(B) 425nm and 400nm
(C) 400nm and 425 nm
(D) 450nm and 400nm
The angular resolution of a 10 cm diameter telescope at a wavelength of 5000 A is of the order of
(a) \(10^6\) rad
(b) \(10^{-2}\) rad
(c) \(10^{-4}\) rad
(d) \(10^{-6}\) rad
High voltage transmission line is preferred as
(a) Its appliances are less costly
(b) Thin power cables are required
(c) Idle current very low
(d) Power loss is very less
To convert a moving coil galvanometer into on ammeter of given range, we must connect:
(a) A suitable low resistance in series
(b) A suitable low resistance in parallel
(c) A suitable high resistance in parallel
(d) A suitable high resistance in series