Question

A charge q is uniformly distributed over a large plastic plate. The electric field at point p, close to the centre of the plate is 10vm1 . If the plastic plate is replaced by a copper plate of the same dimensions and carrying same charge q then the electric field at the point p will be

Answer 1

The electric field due to the plastic plate is 10 V m^-1.

Explanation:

A large plastic plate and copper plate is an example of infinite long plates.

As we know,

• The electric field due to infinite long sheet is
• E = σ / 2 εo
• Here σ is the surface charge density of the thin conducting sheet .
• ε0 is the permittivity of the free space.
• The electric field due to the plastic plate is 10 V m^-1.

Thus the electric field due to the plastic plate is 10 V m^-1.

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Two resistors of 30 and 60 ohms are connected in parallel. How does the current passing through the two resistors compare?

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