Homework Answers
17.
ANS: into the screen.
Use Right hand Thumb Rule or Screw Rule. The rule states that if the thumb points in the direction of current then curling of fingers will give the direction of magnetic field. Here current is flowing upwards, so when right hand thumb points upwards, curling of fingers gives the direction of magnetic field as anti clockwise. Therefore, at point P field is into the screen.
18.
ANS: out of screen.
Use Right hand Thumb Rule or Screw Rule. The rule states that if the thumb points in the direction of current then curling of fingers will give the direction of magnetic field. Here current is flowing udownwards, so when right hand thumb points upwards, curling of fingers gives the direction of magnetic field as clockwise. Therefore, at point P field is out of screen.
19.
ANS: towards left side of the screen
Use Right-hand rule can be used to find the direction of the magnetic field. In this case, point the wrapped fingers (along the coil) in the direction of the conventional current. Then, the thumb will point to the direction of magnetic field within the solenoid. So magnetic field inside the solenoid is towards left.
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