| 1. | A conductor of length L has current I passing through it, when it is placed parallel to a magnetic field. The force experienced by the conductor will be ? | |
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zero
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BLI
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B²LI
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BLI²
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View Answer
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Report Question| 2. | Core of an electromagnet should have ? | |
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low coercivity
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high susceptibility
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both of the above
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none of the above
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| 3. | A certain amount of current flows through a ring-shaped coil with fixed number of turns. How does the magnetic induction B varies inside the coil if an iron core is threaded into coil without dimensional change of coil ? | |
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Decreases
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Increases
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Remains same
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First increases and then decreases depending on the depth of iron insertion
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| 4. | The two conductors of a transmission line carry equal current I in opposite directions. The force on each conductor is ? | |
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proportional to I
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proportional to I²
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proportional to distance between the conductors
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inversely proportional to I²
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| 5. | The electromagnet has 50 turns and a current of 1 A flows through the coil. If the length of the magnet circuit is 200 mm, what is the magnetic field strength ? | |
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2500 AT/m
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250 AT/m
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25 AT/m
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2.5 AT/m
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| 6. | Out of the following statements, concerning an electric field, which statement is not true ? | |
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The electric intensity is a vector quantity
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The electric field intensity at a point is numerically equal to the force exerted upon a charge placed at that point
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An electric field is defined as a point in space at which an electric charge would experience a force
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Unit field intensity in the exertion of a force of one newton on a charge of one coulomb
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| 7. | If a copper disc isrotated rapidly below a freely suspended magnetic needle, the magnetic needle shall start rotating with a velocity ? | |
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less than that of disc but in opposite direction
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equal to that of disc and in the same direction
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equal to that of disc and in the Opposite direction
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ess than that of disc and in the same direction
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