Magnetism

JEE Main 2015 Sample Questions › Electricity and magnetism questions › Magnetism

On two smooth fixed parallel rod, a rod of mass m and kength l is placed. Ends of fixed rod is connected with battery and resistance and uniform magnetic field is present inside the page switch is closed at t=0.

A. when switched is closed rod will move in positive X- direction
B. rate of change of acceleration of rod will increase
C. acceleration of rod is constant
D. initial current in circuit is 0.

#Physics #Electricity and magnetism

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5 Answers

11

Sunil Kumar ·2009-02-15 06:45:42

The answer is A.

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1

Amit Jha ·2009-02-15 06:46:08

pls explain....

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39

Dr.House ·2009-02-15 06:48:20

this one is damn easy dude. E=BVL so i=BVL/R

now as F=BiL THEREFORE F=B²L²V/R

here V IS VELOCITY. now u proceed

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11

Sunil Kumar ·2009-02-15 06:48:33

see At t=0, I = Î¾/R

therefore F = I l B

then by using the Right hand rule u will find that rod moves in +ve X direction...

Got it..

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1

Amit Jha ·2009-02-15 06:48:48

thanks........

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