LENZ'S LAW

a) WHEN A BAR MAGNET MOVES AWAY FROM SOLENOID,MAGNETIC FLUX (a)   .

• DECREASES
• INCREASES
• CONSTANT
• IS EQUAL ZERO

Answer explanation

MAGNETIC FIELD LINES PASS THROUGH THE CROSS SECTIONAL AREA OF SOLENOID DECREASES,THEREFORE MAGNETIC FLUX DECREASES

Tags

NGSS.HS-PS2-5

b) BY USING LENZ'S LAW ,DETERMINE THE DIRECTION OF THE INDUCED MAGNETIC FLUX

• TO THE RIGHT

• TO THE LEFT

• DOWNWARD

• UPWARD

Answer explanation

WHEN EXTERNAL MAGNETIC FLUX(TO THE LEFT) DECREASES, INDUCED MAGNETIC FLUX TO THE RIGHT IS PRODUCED

Tags

NGSS.HS-PS2-5

NGSS.HS-PS3-5

c) LABEL NORTH POLES OF THE SOLENOID

• P

• Q

• R

• S

Answer explanation

BY USING RIGHT HAND GRIP RULE, THE DIRECTION OF THE MAGNETIC FLUX IS NORTH

Tags

NGSS.HS-PS2-5

NGSS.HS-PS3-5

d) BY USING RIGHT HAND GRIP RULE, STATE THE DIRECTION OF INDUCED CURRENT ON THE SOLENOID

• ANTICLOCKWISE

• UPWARDS

• DOWNWARDS

• CLOCKWISE

Answer explanation

THUMB- NORTH

OTHER FINGERS-INDUCED CURRENT

Tags

NGSS.HS-PS2-5

NGSS.HS-PS3-5

a) WHEN THE STRAIGHT CONDUCTOR MOVES TO THE LEFT IN A UNIFORM MAGNETIC FIELD, MAGNETIC FLUX ________

• DOES NOT CHANGE

• DECREASES

• INCREASES

• IS INFINITIY

Answer explanation

WHEN THE STRAIGHT CONDUCTOR MOVES TO THE LEFT,MAGNETIC FIELD LINES (OUT OF THE PAGE) PASS THROUGH THE AREA DECREASES. THEREFORE MAGNETIC FLUX DECREASE

Tags

NGSS.HS-PS2-5

NGSS.HS-PS3-5

b) BY USING LENZ'S LAW, STATE THE DIRECTION OF INDUCED MAGNETIC FLUX.

• TO THE LEFT

• INTO the page

• TO THE RIGHT

• OUT of the page

Answer explanation

WHEN THE MAGNETIC FLUX DECREASES, DIRECTION OF THE INDUCED MAGNETIC FLUX SAME DIRECTION AS EXTERNAL MAGNETIC FLUX

Tags

NGSS.HS-PS2-5

c）DETERMINE THE DIRECTION OF THE NORTH POLE

• OUT

• IN

• TO THE LEFT

• TO THE RIGHT RIGHT

Answer explanation

THE DIRECTION OF THE NORTH POLE FOLLOWS THE DIRECTION OF THE INDUCED MAGNETIC FLUX

Tags

NGSS.HS-PS2-5

NGSS.HS-PS3-5

d) BY USING RIGHT HAND GRIP RULE, DRAW THE DIRECTION OF INDUCED CURRENT ON THE STRAIGHT CONDUCTOR

• CLOCKWISE

• OUT OF THE PAGE

• ANTICLOCKWISE

• INTO THE PAGE

Answer explanation

THUMB- NORTH

OTHER FINGERS-INDUCED CURRENT

Tags

NGSS.HS-PS2-5

NGSS.HS-PS3-5

WHEN A MAGNET BAR MOVES TO A REGION OF DECREASING UNIFORM MAGNETIC FIELD, MAGNETIC FLUX _______.

• DECREASES

• IS ZERO

• INCREASES

• BECOME INFINITY

Answer explanation

MAGNETIC FLUX IS PROPORTIONAL TO MAGNETIC FIELD LINES PASS THROUGH THE CIRCULAR COIL.

(b) BY USING LENZ'S LAW, DETERMINE THE DIRECTION OF THE INDUCED MAGNETIC FLUX

• UPWARDS

• DOWNWARDS

• OUT

• IN

Answer explanation

WHEN THE EXTERNAL MAGNETIC FLUX DECREASES, THE DIRECTION INDUCED MAGNETIC FLUX FOLLOWS THE DIRECTIO OF THE EXTERNAL MAGNETIC FLUX

Tags

NGSS.HS-PS2-5