A proton and a deutron both having the same kinetic energy, enter perpendicularly into a uniform magnetic field B. For motion of proton and deutron on circular path of radius 
and 
respectively, the correct statement is
|
(a) |
(b) |
(c) |
(d) |
(a) 
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The resistivity of a wire depends on its
|
(a) Length |
(b) Area of cross-section |
(c) Shape |
(d) Material |
The number of turns in the primary coil of a transformer is 200 and the number of turns in the secondary coil is 10. If 240 volt AC is applied to the primary, the output from the secondary will be
|
(a) 48 V |
(b) 24 V |
(c) 12 V |
(d) 6 V |
Assertion : In high latitude one sees colourful curtains of light hanging down from high altitudes.
Reason : The high energy charged particles from the sun are deflected to polar regions by the magnetic field of the earth.
|
(a) If both assertion and reason are true and the reason is the correct explanation of the assertion. |
|
(b) If both assertion and reason are true but reason is not the correct explanation of the assertion. |
|
(c) If assertion is true but reason is false. |
|
(d) If the assertion and reason both are false. |
One junction of a certain thermoelectric couple is at a fixed temperature 
and the other junction is at temperature T. The thermo electromotive force for this is expressed by E = K(
] . At temperature 
the thermoelectric power is
|
(a) |
(b) |
(c) |
(d) |
A charge 
exerts some force on a second charge 
. If third charge 
is brought near, the force of exerted on
|
(a) Decreases |
|
(b) Increases |
|
(c) Remains unchanged |
|
(d) Increases if |
