Explanation:
The emf induced is independent of the number of spoke and only depends on the lenght of spoke and the angular speed.
Therefore emf induced is same as before = E
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The capacitance of an air filled parallel plate capacitor is 10μμF . The separation between the plates is doubled and the space between the plates is then filled with wax giving the capacitance a new value of 40
. The dielectric constant of wax is
|
(a) 12.0 |
(b) 10.0 |
(c) 8.0 |
(d) 4.2 |
X-rays which can penetrate through longer distances in substance are called
|
(a) Soft X-rays |
(b) Continuous X-rays |
(c) Hard X-rays |
(d) None of the above |
The structure of solid crystals is investigated by using
| (a) Cosmic rays | (b) X-rays | (c) Infrared radiations | (d) γ - rays |
The ionization potential for second He electron is
|
(a) 13.6 eV |
(b) 27.2 eV |
(c) 54.4 eV |
(d) 100 eV |
When a wire of uniform cross-section a, length l and resistance R is bent into a complete circle, resistance between any two of diametrically opposite points will be
|
(a) |
(b) |
(c) 4R |
(d) |
20 μA current flows for 30 seconds in a wire, transfer of charge will be
|
(a) 2 |
(b) 4 |
(c) 6 |
(d) 8 |
A hydrogen atom in its ground state absorbs 10.2 eV of energy. The orbital angular momentum is increased by (Given Planck constant h = 6.6 
J - sec)
|
(a) 1.05 |
(b) 3.16 |
(c) 2.11 |
(d) 4.22 |
Wave which cannot travel in vacuum is
|
(a) X-rays |
(b) Infrasonic |
(c) Ultraviolet |
(d) Radiowaves |
A frog can be deviated in a magnetic field produced by a current in a vertical solenoid placed below the frog. This is possible because the body of the frog behaves as
|
(a) Paramagnetic |
(b) Diamagnetic |
(c) Ferromagnetic |
(d) Antiferromagnetic |
