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Q. Jingdan turned a screwdriver into a magnet by rubbing it with a strong bar magnet to pick up a screw that has fallen into an inaccessible spot.
How could he demagnetize his screwdriver after picking up the screw?
He could drop it, heat it, hit it with a hammer, or somehow otherwise jiggle the magnetic domains into randomness.
Define, with the help of diagram, the principle and working of an a.c. Generator. Write the expression for the e.m.f. generated in the coil in terms of its speed of rotation
A galvanometer with a coil of resistance 120 ohm shows full scale deflection for a current of 2.5 mA. How will you change the galvanometer into an ammeter of range 0 to 7.5 A? Veri
derive the equation for reflection and transmission coefficient for s polarization
calculate the acceleratio due to gravity on planet mercury if mass = 2.99 x 10 9to the power 23)kg and radius = 2.42 x 10( to the power 6) metres.
Can you explain solenoidal field? Describe with example?
State the principle of working of p-n diode as a rectifier. Describe, with the help of a circuit diagram, the use of p-n diode as a full wave rectifier. Illustrate a sketch of the
what happened if we connect ammeter parallel to the resistor, whose current we wnt to find ,rather than in series?
ways and rules of finding moment of force
Q. Describes the construction of a 'Nicol Prism' and explains its action in converting UPL into PPL. Sol. Nicol Prism: This is the most simple and elegant polarizer and
how to solve question for kinematics problem
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