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The focal length of a concave mirror is 20 cm. Where should an object be placed to get an image of the same size?
The balance point in a potentiometer for a cell of emf 1.5 V is 60 cm. If a resistance of 5 Ω is connected in parallel with the cell and the new balanc...
The magnetic equator is closely associated with which of the following?
The time period of a simple pendulum depends on —
A coil with N turns and area A is placed in a magnetic field varying as B = B₀·e–αt. What is the induced EMF at time t = 0?
What does 'IC' stand for in electronics?
A rod PQ of length 0.6 m moves on smooth rails with speed 3 m/s in a magnetic field B = 0.5 T. The rails form a closed circuit with 4 Ω resistance. Fin...
A particle starts from rest and accelerates uniformly at 2 m/s² for 5 seconds, then moves with constant speed for 5 seconds and finally decelerates uni...
The resistance of a wire is 10 Ω. What will be its resistance if its length is tripled? (Assume uniform cross-sectional area)
