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March 25, 2017

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a wire 4m long carrying current of 5A place at right angle to B of 6web/m2 the force experience by the wire in SI unit is A LONG SPRING IS STRETCHED BY 2Cm and P.E stored in it is U if the string is stretched by 10 cm then the P.E stored would be

  • physics - ,

    1.
    F=I•B•L=5•6•4=120 N
    2.
    U=k•x1²/2.
    k=2•U/x1²
    pe=k•x2²/2 =2•U•x2²/2•x1²=U•x2²/x1²=
    =U(10/2)²=25U.

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