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Two circular coil of radii 5cm and 10cm ...

Two circular coil of radii 5cm and 10cm carry equal currents of 2A. The coils have 50 and 100 turns, respectively, and are placed in such a way that their planes as well as their centers coincide. Magnitude of magnetic field at the common centre of coils is

A

`8pixx10^-4T` if currents in the coils are in same sense

B

`4pixx10^-4T` if current in the coils are in opposite sense

C

zero if currents in the coils are in opposite sense

D

`8pixx10^-4` T if currents in the coils are in opposite sense

Text Solution

Verified by Experts

The correct Answer is:
A, C

`B_1=(mu_0N_1iI_1)/(2R_1)`
`=((4pixx10^I-7)(50)(2))/(2(5xx10^-2))`
`=4pixx10^-4T`
`B_2=(mu_0N_2i_2)/(2R_2)`
`=((4pixx10^-7)(100)(2))/((2)(10xx10^-2))`
`=4pixx10^-4T`
When currets are in the same direction then
`B_("net")=B_1+B_2`
When curents are in the opposite direction, then
`B_("net")=B_1-B_2`
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(i) Two circular coils of raddii 5.0 cm and 10 cm carry equla currents of 1 A .The coils have 50 and 100 turns respectively and are placed in such a way that their planes as well as the centre coincide.Find the magnitude of the magnetic field B at the common centre when the currents in the coils are (a) in the same sense ,(b) in the opposite sense. (ii) If the outer coil of the above problem is rotated through 90^(@) about a diameter,what would be the magnitude of the magnetic field B at the centre?

Two circular coils of radii 5.0 cm and 10 cm carry equal currents of 2.0 A. The coils have 50 and 100 turns respectively and are placed in such a way that their planes as well as the centres coincide. Find the magnitude of the magnetic field B at the common centre of the coils if the currents in the coils are (a) in the same sense (b) in the opposite sense.

Knowledge Check

  • A circular coil of radius 10 cm "and" 100 turns carries a current 1A. What is the magnetic moment of the coil?

    A
    `3.142xx10^(4) A-m^(2)`
    B
    `10^(4)A-m^(2)`
    C
    `3,142 A-m^(2)`
    D
    `3 A-m^(2)`
  • A circular coil of radius 10 cm having 100 turns carries a current of 3.2 A. The magnetic field at the center of the coil is

    A
    `2.01 xx 10^(-3)T`
    B
    `5.64 xx 10^(-3)T`
    C
    `2.64 xx 10^(-3)T`
    D
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  • Two concentric circular coils A and B have radii 25cm and 15cm and carry currents 10A and 15A respectively. A has 24 turns and B has 18 turns. The direction of currents are in opposite order. The magnetic induction at the common centre of the coil is

    A
    `120 mu_(0)T`
    B
    `480 mu_(0)T`
    C
    `420mu_(0)T`
    D
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