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A toy car ( made of soft iron ) and two ...

A toy car ( made of soft iron ) and two bar magnets are arranged as shown in the figure. What would happen if the magnet 'A' is moved towards the car as shown in the figure. ?

A

The car will not have any impact due to the motion of the magnet .

B

The car moves away from magnet A.

C

The car moves towards magnet A.

D

The car moves till it is exactly mid-way between the two magnets.

Text Solution

Verified by Experts

Since the front part of the toy car is in contact with the south pole of a magnet B, its rear part acts as the south pole. As magnet A moves towards the rear part of the car, it should move away from magnet A due to magnetic repulsion.
Hence , the correct option is (b).
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  • The magnetic field at the centre O of the are shown in the figure is

    A
    `2I(sqrt(2)+pi)xx(10^(-7))/(r)`
    B
    `2I(sqrt(2)+(pi)/(4))xx(10^(-7))/(r)`
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  • The magnetic induction at center O as shown in the figure is

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    `(mu_(0)I)/(2a) + (mu_(0)I)/(2b) ox`
    B
    `(3mu_(0)I)/(8a) + (mu_(0)I)/(8b) ox`
    C
    `(3mu_(0)I)/(8a) - (mu_(0)I)/(8b) ox`
    D
    `(3mu_(0)I)/(8a) + (mu_(0)I)/(8b) o.`

  • The magnetic field lines due to a bar magnet are correctly shown in figure.

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