- AMagnetic field
- BArea of a coil
- CNumber of turns
- DNone of these
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
A rod of length 20 cm is rotating with angular speed of 100 rps in a magnetic field of strength 0.5 T about it’s one end. What is the potential difference between two ends of the rod
|
(a) 2.28 V |
(b) 4.28 V |
(c) 6.28 V |
(d) 2.5 V |
An object is placed at a distance u from a simple microscope of focal length f. The angular magnification obtained depends:
Current i is carried in a wire of length L. If the wire is turned into a circular coil, the maximum magnitude of torque in a given magnetic field B will be
|
(a) |
(a) |
(c) |
(d) |
The ratio of the speed of the electron in the first Bohr orbit of hydrogen and the speed of light is equal to (where e, h and c have their usual meanings)
|
(a) 2πhc/ |
(b) |
(c) |
(d) 2π |
The sensitiveness of a moving coil galvanometer can be increased by decreasing
|
(a) The number of turns in the coil |
|
(b) The area of the coil |
|
(c) The magnetic field |
|
(d) The couple per unit twist of the suspension |
Effective capacitance between A and B in the figure shown is (all capacitance are in mF)
|
(a) 21 mF |
(b) 23 mF |
(c) |
(d) |