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How many photons (nearly) per square metre are incident on the Earth per second? Assume that the photons in the sunlight have an average wavelength of 550 nm.Ī difference of 2.3 eV separates two energy levels in an atom. The energy flux of sunlight reaching the surface of the earth is 1.388 × 10 3 W/m 2. What is the magnitude of torque experienced by the coil? The coil is suspended vertically and the normal to the plane of the coil makes an angle of 30º with the direction of a uniform horizontal magnetic field of magnitude 0.80 T. What is the magnetic force on the wire?Ī square coil of side 10 cm consists of 20 turns and carries a current of 12 A. The magnetic field inside the solenoid is given to be 0.27 T. What value of current (with appropriate sense of circulation) in the windings of the solenoid can support the weight of the wire? g = 9.8 m s -2Ī 3.0 cm wire carrying a current of 10 A is placed inside a solenoid perpendicular to its axis. The wire is connected through two leads parallel to the axis of the solenoid to an external battery which supplies a current of 6.0 A in the wire. A 2.0 cm long wire of mass 2.5 g lies inside the solenoid (near its centre) normal to its axis both the wire and the axis of the solenoid are in the horizontal plane. Recently Viewed Questions of Class 12 PhysicsĪ solenoid 60 cm long and of radius 4.0 cm has 3 layers of windings of 300 turns each. If the electric field 20 cm from the centre of the sphere is 1.5 × 10 3 N/C and points radially inward, what is the net charge on the sphere? What is the net electric flux through the surface?Ī conducting sphere of radius 10 cm has an unknown charge. What is the magnitude of the electric flux through the square? (Hint: Think of the square as one face of a cube with edge 10 cm.)Ī point charge of 2.0 μC is at the centre of a cubic Gaussian surface 9.0 cm on edge.
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Calculate the potential at the centre of the hexagon.Ī point charge +10 μC is a distance 5 cm directly above the centre of a square of side 10 cm, as shown in Fig. How much electrostatic energy is lost in the process?Ī regular hexagon of side 10 cm has a charge 5 ♜ at each of its vertices. It is then disconnected from the supply and is connected to another uncharged 600 pF capacitor. What is the magnitude of the magnetic field B at the centre of the coil?Ī 600 pF capacitor is charged by a 200 V supply.
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(a) Estimate the number of electrons transferred (from which to which?)
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What is the force between two small charged spheres having charges of 2 x 10 -7 C and 3 x 10 -7 C placed 30 cm apart in air?Ī polythene piece rubbed with wool is found to have a negative charge of 3 × 10 −7 C. An infinite line charge produces a field of 9 × 10 4 N/C at a distance of 2 cm.