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The inward and outward flux are `phi_1 ` and `phi_2` respectively then the charge inside the surface is:

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Knowledge Check

  • Equations of a stationary and a travelling waves are as follows - y_1=a sin kx. "cos"omega t "and "y_2= a "sin" (omega t-kx) . The phase difference between two points x_1=pi/3k and x_2=(3pi)/(2K) are phi_1 "and " phi_2 respectively for the two waves . The ratio (phi_1)/(phi_2) is

    A
    1
    B
    `5/6`
    C
    `3/4`
    D
    `6/7`

  • A simple pendulum of length L and mass m is oscillating in a vertical plane about a vertical line between angular limits (-phi) and (+phi) for displacement theta[theta] lt (phi) the tension in the string and velocity of bob are T and v respectively. The following relations hold good under the above condition.

    A
    `Tcostheta=mg`
    B
    `T-mg cos theta=(mv^2)/L`
    C
    Tangential acceleration =`gsintheta`
    D
    `T=mgcostheta`

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    Careful measurement of the electric field at the surface of a black box indicates that the net outward flux through the surface of the (a) what ist the net charge inside the box (b) if the net outward flux through the surface of the box wre zero could you conclude that there were no charges inside the box why or why not

    Careful measurement of the electric field at the surface of a black box indicates that the net outward flux through the surface ofthe box is 8.0x10^3Nm^2//C . What is the net charge inside the box ?

    A coil of resistance R having n turns is connected with a galvanometer of resistance 4R. If the magnetic flux changes from phi_(1) to phi_(2) in time t in the circuit, what will be the value of induced current?

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    The instantaneous magnetic flux phi in a, circuit is phi = 4t^2 - 4t + 1 . The total resistance of the circuit is 10Omega . At t = 1/2s , the induced current is—

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