The production of e.m.f. by maintaining a difference of temperature between the two junctions of two different metals is known as
|
(a) Joule effect |
(b) Seebeck effect |
(c) Peltier effect |
(d) Thomson effect |
(b) Seebeck effect
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An object is placed at a distance of 20 cm from a convex lens of focal length 10 cm. The image is formed on the other side of the lens at a distance
|
(a) 20 cm |
(b) 10 cm |
(c) 40 cm |
(d) 30 cm |
The waves used in telecommunication are
|
(a) IR |
(b) UV |
(c) Microwave |
(d) Cosmic rays |
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 |
A particle of charge q and mass m is moving along the x -axis with a velocity v and enters a region of electric field E and magnetic field B as shown in figure below for which figure the net force on the charge may be zero
|
(a)
|
(b)
|
(c)
|
(d)
|
