- AElectric field.
- BMagnetic field.
- CNorth field.
- DAll.
Explanation:
Space surrounding a magnet in which magnetic force is executed, is called a magnetic field.
A magnetic field is a vector field that describes the magnetic influence of electrical currents and magnetized materials. In everyday life, the effects of magnetic fields are most readily encountered with nearby permanent magnets, which pull on magnetic materials (such as iron) and attract or repel other magnets.
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Assertion : A person touching a high power line gets stuck with the line.
Reason : The current carrying wires attract the man towards it.
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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. |
The minimum wavelength of X-rays produced by electrons accelerated by a potential difference of volts is equal to
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(a) |
(b) |
(c) |
(d) |
The sensitiveness of a moving coil galvanometer can be increased by decreasing
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(a) The number of turns in the coil |
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(b) The area of the coil |
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(c) The magnetic field |
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(d) The couple per unit twist of the suspension |
A lamp emits monochromatic green light uniformly in all directions. The lamp is 3% efficient in converting electrical power to electromagnetic waves and consumes 100W of power. The amplitude of the electric field associated with the electromagnetic radiation at a distance of 10m from the lamp will be
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(a) 1.34 V/m |
(b) 2.68 V/m |
(c) 5.36 V/m |
(d) 9.37 V/m |