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A conducting ring is placed around the c...

A conducting ring is placed around the core of an electromagnet as shown in fig. when key `K` is pressed, the ring

A

remain stationary

B

is attracted towards the electromagnet

C

jumps out of the core

D

none of the above

Text Solution

Verified by Experts

The correct Answer is:
C
When key `k` is pressed, current through the electromagnet start increasing i.e., flux linked with ring increase which produces repulsion effect.
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A2Z-ELECTROMAGNETIC INDUCTION-Section D - Chapter End Test
  1. A conducting ring is placed around the core of an electromagnet as sho...

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  2. Two pure inductors each of self-inductance L are connected in parallel...

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  3. A coil and a bulb are connected in series with a dc source, a soft iro...

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  4. The current flowing in a coil of self-inductance 0.4 mH is increased b...

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  5. 5 cm long solenoid having 10 ohm resistance and 5mH induced is joined ...

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  6. A solenoid has an inductance of 60 henrys and a resistance of 30 ohms....

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  7. In a circular conducting coil, when current increases from 2A to 18A i...

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  8. Find out the e.m.f. produced when the current change from 0 to 1A in 1...

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  9. A coil of 100 turns carries a current of 5mA and creates a magnetic fl...

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  10. If the current 30A flowing in the primary coil is made zero in 0.1 sec...

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  11. A square loop of side 5 cm enters a magnetic field with 1cms^(-1). The...

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  12. A small coil is introduced between the poles of an electromagnet so th...

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  13. Two circular coils A and B are facing each other as shown in figure. T...

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  14. If in a coil rate of change of area is (5meter^(2))/(milli second)and ...

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  15. Two coils P and Q are placed co-axially and carry current I and I' re...

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  16. The phase difference between the flux linkage and the induced e.m.f. i...

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  17. A hundred turns of insulated copper wire are wrapped around an iron cy...

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  18. In circular coil, when no. of turns is doubled and resistance becomes ...

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  19. In a transformer, number of turns in the primary coil are 140 and that...

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  20. Two coil are placed close to each other. The mutual inductance of the ...

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  21. When the current changes from +2A to -2A in 0.05 second, an e.m.f. of ...

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