- AAttractive
- BRepulsive
- CBoth attractive and repulsive
- DNeither attractive nor repulsive
Explanation:
If electric current in two long straight conductors is in mutually opposite directions, the magnetic force acting between them will be repulsive.
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The ripple factor in a half wave rectifier is
|
(a) 1.21 |
(b) 0.48 |
(c) 0.6 |
(d) None of these |
A metallic sheet is inserted between the plates of a parallel plate capacitor. The capacitance of the capacitor
|
(a) Increases |
|
(b) Is independent of the position of the sheet |
|
(c) Is maximum when the metal sheet in the middle |
|
(d) a, b |
Dynamo core is laminated because
|
(a) Magnetic field increases |
|
(b) Magnetic saturation level in core increases |
|
(c) Residual magnetism in core decreases |
|
(d) Loss of energy in core due to eddy currents decreases |
