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How will the magnetic field intensity B...

How will the magnetic field intensity B at the centre of a circular coil carrying current change, If the current through the coil is doubled and the radius of the coil is halved ?

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The magnetic field at the centre of the coil . `B prop (1)/(R)` .
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KUMAR PRAKASHAN-MAGNETIC EFFECTS OF ELECTRIC CURRENT -ANSWER THE FOLLOWING QUESTIONS IN VERY SHORT AS DIRECTED (MISCELLANEOUS):
  1. List two sources of magnetic fields .

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  2. There are two wires. One of them carries a current . How will you find...

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  3. How will the magnetic field intensity B at the centre of a circular...

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  4. PQ is a current - carrying long straight conductor in the plance of...

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  5. PQ is a current - carrying long straight conductor in the plane of ...

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  6. In the experiment to show that a current - carrying condcutor (rod) ...

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  7. A compass needle is placed near a current - carrying straight wire ....

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  8. The magnetic field lines of two bar magnets A and B are shown belo...

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  9. Name any two source of direct current .

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  10. Name the device used to prevent damage to the electrical appliance ...

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  11. State value of potential difference between the live wire and neut...

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  12. State one difference between the wires used in the element of an ele...

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  13. In a domestic electric ciruit -wiring , with which wire do we con...

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  14. Mention two ways to increases the strength of the magnetic field of ...

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  15. Give the significance of the electric meter in a domestic circuit.

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  16. A domestic circuit has a line of 5A ratting. How many lamps of ratt...

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  17. Give any two uses of an electromagnet .

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  18. A constant current I flows in a horizontal wire in the plane of paper...

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  19. How do you magnetisea piece of magnetic material ?

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  20. How does the current in a domestic circuit differ from that used to...

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