- AUndergoes acceleration all the time.
- BSpeeds up between the dees because of the magnetic field.
- CSpeeds up in a dee.
- DSlows down within a dee and speeds up between dees.
Solution:
In a cyclotron, a charged particle describes the circular path inside the dees & is accelerated while going from one dee to another due to the electric field.
While moving in the circular path, charged particles have centripetal acceleration which is provided by the magnetic force due to the magnetic field.
A charged particle undergoes acceleration all the time, inside the cyclotron.
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Assertion : Ultraviolet radiation are of higher frequency waves are dangerous to human being.
Reason : Ultraviolet radiation are absorbed by the atmosphere
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(a) If both assertion and reason are true and the reason is the correct explanation of the assertion. |
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(b) If both assertion and reason are true but reason is not the correct explanation of the assertion. |
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(c) If assertion is true but reason is false. |
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(d) If the assertion and reason both are false. |
A galvanometer, having a resistance of 50 W gives a full scale deflection for a current of 0.05 A. The length in meter of a resistance wire of area of cross-section 2.97 X 10–2 cm2 that can be used to convert the galvanometer into an ammeter which can read a maximum of 5 A current is (Specific resistance of the wire = 5 Wm)
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(a) 9 |
(b) 6 |
(c) 3 |
(d) 1.5 |
A convex lens is dipped in a liquid whose refractive index is equal to the refractive index of the lens. Then its focal length will
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(a) Become infinite |
(b) Become small, but non–zero |
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(c) Remain unchanged |
(d) Become zero |
If two bulbs of wattage 25 and 30, each rated at 220 volts, are connected in series with a 440 volt supply, which bulb will fuse
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(a) 25 W bulb |
(b) 30 W bulb |
(c) Neither of them |
(d) Both of them |