There are four different points on a plane such that no three are collinear. The number of distinct straight lines that can be drawn through them is?
A8
B4
C2
D6
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Two wires A and B are made of same material and have the same length but different cross-sectional areas. If the resistance. of wire A is 9 times the resistance of wire B, the ratio of the radius of wire A to that of wire B is?
Which of the following statements are correct?
- (a). For a lens the first principal focus is the position of the object whose image is at infinity
- (b) For a lens the first principal focus is the position of the object whose image is formed at twice the focal length.
- (c) For a lens the second principal focus is the position of the real image whose object is at infinity
- (d) For a lens the second principal focus is the position of the object whose image is formed at twice the focal length
How does a dipole behave when it is placed in a uniform magnetic field?
റേഡിയോ ആക്ടിവിറ്റി കണ്ടെത്തിയത് ?
' റോക്കറ്റ് മാൻ ഓഫ് ഇന്ത്യ' എന്നറിയപ്പെടുന്നത് ?