Lenz’s law is a consequence of the law of conservation of
The electrical entity inductance can be compared to the mechanical entity
A jet plane is flying horizontally at a speed of 1800 km/hour. What is the potential difference developed between the tips of its wings if the wing span is 25m? Earth’s magnetic field at the location is 0.4 gauss and the angle of dip is 30°.
A circular copper disc 10cm in diameter rotates 1800 times per minute about a central axis at right angles to the plane of the disc. A uniform magnetic field of 1 tesla is applied perpendicular to the plane of the disc. The voltage induced between the centre and the edge of the disc is
A copper rod 10cm long rotates 1800 times per minute about an axis passing through one end at right angles to the rod. A uniform magnetic field of 1 tesla is applied perpendicular to the plane of rotation. The voltage induced between the ends of the rod is
A varying magnetic flux linking a coil is given by F = Xt2. If at time t=3s, the emf induced is 9V, then the value of X is
A bar magnet is allowed to fall through a metal ring. The acceleration of the ring during the fall is
A magnet is moved towards a coil (i) quickly (ii) slowly, their. the induced e.m.f is
A coil of insulated wire is connected to a battery. If it is taken to a galvanometer, its pointer is deflected, because,
A uniform metal rod of length I is moved with a velocity v parallel to a magnetic field B. The e.m.f. induced across its ends is,
Two pure inductors, each of self inductance L are connected in parallel but are well separated from each other, then the total inductance is
The self inductance of a coil does not depend on