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Direction of electricity -

The direction of an electric current is by convention the direction in which a positive charge would move. Thus, the current in the external circuit is directed away from the positive terminal and toward the negative terminal of the battery. Electrons would actually move through the wires in the opposite direction.

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Posted by

Deependra Verma

No. since capacitance is a proportionality constant, it depends neither on the charge on the plates nor on the potential. It only depends upon the size, shape of the capacitor and the separation between the plates. The formula that shows its dependence on the size and shape of the capacitor is as follows:

Here, A is the area of the plates of the capacitor and d is the distance between the plates of the capacitor, which you will study in higher classes.

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shubham.krishnan

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Does the potential difference between two points depend on the choice of zero potential or zero potential energy?

Potential difference between two points is always a difference therefore it does not depend on the choice of zero potential.

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shubham.krishnan

Two equipotential surfaces cannot intersect. If they intersect, then at the point of intersection, there will be two values of potential, which is not possible.

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shubham.krishnan

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In the direction of electric field, potential always decreases.

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shubham.krishnan

Gauss Law is valid for any type of charge distribution, but it is easier to calculate for symmetric ones as some easy and known surface can be used as Gaussian surface. But if not symmetrical then the Gaussian surface may be an awkward shape and so evaluation becomes harder.

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shubham.krishnan

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shubham.krishnan

Area vector is a vector whose magnitude is equal to the area and is directed normal to the surface.

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shubham.krishnan

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What is the role of external pinna in the outer ear?

The function of the pinna is to act as a kind of funnel which assists in directing the sound further into the ear.

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Posted by

Deependra Verma

Why echoes are easily produced in mountains and deep valleys?

Dear candidate,

Sound also acts like a wave. Mountains and deep valley areas are surrounded by the rocky surfaces of mountains, trees, etc and the area among them is also dense. Thus, when the sound wave touches the rocky surface, it comes back, and since there is no specific direction, it echoes everywhere.

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Posted by

Anjali Nagar

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