In Young's double slit experiment, the phase difference between the light waves reaching third bright fringe from the central fringe will be (λ =6000 Å )
|
(a) Zero |
(b) 2π |
(c) 4 π |
(d) 6 π |
(d) 6 π
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When the distance between the charged particles is halved, the force between them becomes
|
(a) One-fourth |
(b) Half |
(c) Double |
(d) Four times |
Assertion : The induced e.m.f. and current will be same in two identical loops of copper and aluminium, when rotated with same speed in the same magnetic field.
Reason : Induced e.m.f. is proportional to rate of change of magnetic field while induced current depends on resistance of wire.
|
(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 assertion is false but reason is true. |
The temperature coefficient of resistance of a semiconductor
|
(a) Is always positive |
(b) Is always negative |
|
(c) Is zero |
(d) May be positive or negative or zero |
A proton accelerated by a potential difference 500 KV moves though a transverse magnetic field of 0.51T as shown in figure. The angle θ through which the proton deviates from the initial direction of its motion is
|
(a) 15° |
(b) 30° |
(c) 45° |
(d) 60° |
The current between B and D in the given figure is
|
(a) 1 amp |
(b) 2 amp |
(c) Zero |
(d) 0.5 amp |
Two opposite and equal charges 4 × 
when placed 2 
cm away, form a dipole. If this dipole is placed in an external electric field 4 
, the value of maximum torque and the work done in rotating it through 180° will be
|
(a) 64 |
(b) 32 |
|
(c) 64 |
(d) 32 |
