Physics-
General
Easy
Question
a bar of steel is placed in a solenoid, then it changes to ______.
- an electric bell
- an electromagnet
- a dynamo
- a permanent magnet
The correct answer is: an electromagnet
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A galvanometer has resistance G and a current 
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The minimum value of V0 such that ultimately it rolls on the upper surface. If distance AB is very large. (S is perfectly rough and V0 = 
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A uniform thin rod of mass M and length L is standing vertically along the Y–axis on a smooth horizontal surface with its lower end at origin (0, 0). A slight disturbance at t = 0 causes the lower end to slip on smooth surface along the positive X–axis and the rod starts falling. The path followed by the centre of mass of the rod during its fall is a/an.
A uniform thin rod of mass M and length L is standing vertically along the Y–axis on a smooth horizontal surface with its lower end at origin (0, 0). A slight disturbance at t = 0 causes the lower end to slip on smooth surface along the positive X–axis and the rod starts falling. The path followed by the centre of mass of the rod during its fall is a/an.
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At 
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