How do I use the right hand rule to answer the following questions? Please expla

Question

How do I use the right hand rule to answer the following questions?

Please explain clearly....

The magnetic field perpendicular to a circular loop of wire 16 cm in diameter is changed from +0.52 T to -0.45 T in 204 ms, where + means the field points away from an observer and - toward the observer. In what directions does the induced current flow?

A circular wire loop 40 cm in diameter has 100 resistance and lies in a horizontal plane. A uniform magnetic field points vertically downward, and in 28 ms it increases linearly from 4.0 mT to 53 mT. Which way does this current flow?

Explanation / Answer

calculate B ,

B2 - B1 = -0.45 - 0.52 = - 0.97 ,

so B points towards the observer , since the sign is negative ,

so the induced field is the wire is such that it produces field in the + direction , opposite to B ,

i e away from the observer , i e away from us ,

put your right hand thumb in direction of induced field , ie in the +direction , away from the observer ,

the fingers will curl in clockwise direction , so the induced current is in clockwise direction ,

even for the second problem ,

here the direction of B is in the the downward direction , so induced B will be in the upward direction ,

so put ur right hand thumb in the upwrds direction , fingers curl in the anticlokwise direction ,current flows

in anticlock wise direction

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