- ANature of material
- BArea of cross-section
- CLength
- DViscosity
Explanation:
The resistance of a conductor is directly proportional to its length, inversely proportional to the area of cross-section, and nature of the material. The resistance of the conductor does not depend on viscosity.
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$\text{E}_0\text{k}=\text{B}_0\omega$
$\text{E}_0\text{B}_0=\omega\text{k}$
$\text{E}_0\omega=\text{B}_0\text{k}$
A charge q coulomb moves in a circle at n revolutions per second and the radius of the circle is r metre. Then magnetic field at the centre of the circle is
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(a) |
(b) |
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(c) |
(d) |
Assertion : Free electron always keep on moving in a conductor even then no magnetic force act on them in magnetic field unless a current is passed through it.
Reason : The average velocity of free electron is zero.
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(a) If both assertion and reason are true and the reason is the correct explanation of the assertion. |
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(b) If both assertion and reason are true but reason is not the correct explanation of the assertion. |
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(c) If assertion is true but reason is false. |
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(d) If the assertion and reason both are false. |
As our eyes can not retrace the bent path of light, a stick, dipped in water, appears: