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Q. Action to be made if the resistance to earth of earth electrode is high?
Ans: Earth resistance lies upon soil conductivity. To reduce earth resistance dig around the earth electrode, clean all the rust around earth pipe or plate. Sprinkle the common salt dissolved water in the pit and pack it up with powdered coke and salt. If it is not possible give additional earths and connects all the earth points in parallel by solid jumper connections.
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a catapult can hurl a rock straight up in the air 45 m high. What is the maximun range of the catapult?
STABLE EQUILIBRIUM If object is in stable equilibrium and if we displace object to a very little displacement dr then it will return back to starting position. UNSTABLE EQU
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(i) Electric field lines come out of positive charge and go into the negative charge. (ii) Tangent to the field line at any point gives the direction of the field at that point.
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