MULTIPLE CHOICE QUESTIONS 1) A positive charge enters a...

MULTIPLE CHOICE QUESTIONS 1) A positive charge enters a uniform magnetic field as shown. What is the direction of the magnetic force? A) out of page B) into the page C) Downward D) Upward E) to the left 2) A beam of atoms enters a magnetic field region. What path will the atoms follow? A) a B) b C) c D) d 3) Two particles of the same mass enter a magnetic field with the same speed and follow the paths shown. Which particle has the bigger charge? A) a B) b C) both charges are equal D) impossible to tell from the picture 4) A rectangular current loop with a clockwise current is in a uniform magnetic field. What is the direction of the net force on the loop? A) + x B) + y C) zero D) - x E) - y

Transcript

00:01 This question, a positive charge enters a uniform magnetic field so what is the direction of the magnetic force? so remember, the direction is given by right hand rule where the index finger of the right hand points towards the velocity, middle finger points towards the magnetic field, and the thumb naturally gives the direction of the force.

00:21 So if we use that, and by the way, this is for a positive charge.

00:24 For a negative, if the charge is negative, then the direction is exactly opposite to what is.

00:30 Given by this rule but nevertheless this is positive we don't have to worry about it and if we use this rule then we are getting the direction of the force as vertically upwards like this so the direction is upwards so option d question number two it talks about if a beam enters a magnetic field region beam of atoms then what will be the part of the atom and once again it enters like this so the magnetic field will be on the upside so it will definitely tilt towards the upside so option is the best choice because the force is up therefore a talk about part question number three then two particles the same mass enters the magnetic field the same speed and follow this path is shown then the particle with the bigger charge which is the particle of the bigger charge so i think this is a and this is b so remember that the radius when it it is moving in a magnetic field in a circle is given by mv or bq m and v and b and b is constant is given in the question so uh it is inversely proportional to the charge so a is having a higher radius that has a smaller charge b is a smaller radius that has a bigger charge so definitely it's going to be option number b and finally rectangular loop with a clockwise current is placed in a uniform magnetic field for the direction of the net force.

02:05 Remember that the net force is going to be zero...

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