Electroplating does not help in
|
(a) Fine finish to the surface |
(b) Shining appearance |
|
(c) Metals to become hard |
(d) Protect metal against corrosion |
(c) Metals to become hard
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Among the following properties describing diamagnetism identify the property that is wrongly stated
|
(a) Diamagnetic material do not have permanent magnetic moment |
|
(b) Diamagnetism is explained in terms of electromagnetic induction |
|
(c) Diamagnetic materials have a small positive susceptibility |
|
(d) The magnetic moment of individual electrons neutralize each other |
The magnetic field at the centre of a circular coil of radius r is π times that due to a long straight wire at a distance r from it, for equal currents. Figure here shows three cases : in all cases the circular part has radius r and straight ones are infinitely long. For same current the B field at the centre P in cases 1, 2, 3 have the ratio
|
(a) |
(b) |
|
(c) - |
(d) |
$\frac{1}{2}$
$2$
$\frac{1}{4}$
$4.$
The magnetic flux linked with coil, in weber is given by the equation, 
The induced emf in the coil in the fourth second is
|
(a) 10 V |
(b) 30 V |
(c) 45 V |
(d) 90 V |
The lateral displacement depends on ______:
