Coherent sources are those sources for which
|
(a) Phase difference remain constant |
|
(b) Frequency remains constant |
|
(c) Both phase difference and frequency remains constant |
|
(d) None of these |
(c) Both phase difference and frequency remains constant
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In a cyclotron, the angular frequency of a charged particle is independent of
|
(a) Mass |
(b) Speed |
(c) Charge |
(d) Magnetic field |
A magnetic needle is made to vibrate in uniform field H, then its time period is T. If it vibrates in the field of intensity 4H, its time period will be
| (a) 2T | (b) T/2 | (c) 2/T | (c) 2/T |
The magnet of a vibration magnetometer is heated so as to reduce its magnetic moment by 19%. By doing this the periodic time of the magnetometer will
|
(a) Increase by 19% |
(b) Decrease by 19% |
(c) Increase by 11% |
(d) Decrease by 21% |
A uniform wire of resistance R is uniformly compressed along its length, until its radius becomes n times the original radius. Now resistance of the wire becomes
|
(a) |
(b) |
(c) |
(d) nR |
