HSC Physics MC Thread (3 Viewers)

[spatula232]

Believe the answer is B. Check your right hand palm rule again. Your thumb should be pointing upwards, with your fingers curling around in the anti-clockwise direction; making a south pole at the bottom of the solenoid

 

[Mr_Kap]

You might have the right hand rule the wrong way. I think the fingers point in the north direction of the b-field so the field goes up

mag field direction goes from NORTH to SOUTH though, so that's why you point your thumb to the south

 

[Mr_Kap]

Believe the answer is B. Check your right hand palm rule again. Your thumb should be pointing upwards, with your fingers curling around in the anti-clockwise direction; making a south pole at the bottom of the solenoid

why should thumb point upwards???


mag field direction goes from NORTH to SOUTH

 

[atargainz]

Believe the answer is B. Check your right hand palm rule again. Your thumb should be pointing upwards, with your fingers curling around in the anti-clockwise direction; making a south pole at the bottom of the solenoid

this question put me on tilt wtf, correct me if i'm wrong if you make a south pole at the bottom of the solenoid, wouldn't the mag field go down? (because goes from north to south)

 

[Mr_Kap]

OR IS IT THE OPPOSITE DIRCTION IN THE RIGHT HAND CURL RULE!!!!

WOW!! NEVER KNEW THAT!!

cant believe its opposite --> Mind blown

 

[Mr_Kap]

CHECK THIS PICTURE OUT:

 

[atargainz]

why should thumb point upwards???


mag field direction goes from NORTH to SOUTH

For the RHGR, thumb points to the north pole, not in the direction of the mag field I believe

 

[malcolm21]

CHECK THIS PICTURE OUT:

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bruh

 

[Mr_Kap]

bruh

was an accident i swear.. lol.

I got the picture workin now.

 

[Mr_Kap]

I swear you learn something knew everyday.

So does the mag field ALWAYS go to the north if using the CURL rule??

 

[keepLooking]

OR IS IT THE OPPOSITE DIRCTION IN THE RIGHT HAND CURL RULE!!!!

WOW!! NEVER KNEW THAT!!

cant believe its opposite --> Mind blown

Same here. I feel stupid forgetting Year 11 stuff. ;(

 

[atargainz]

da fuk I still don't get why it's B

 

[DattMyball]

I swear you learn something knew everyday.

So does the mag field ALWAYS go to the north if using the CURL rule??

Yeah pretty sure it does

 

[keepLooking]

da fuk I still don't get why it's B

Lenz's Law. As magnet with South pole is moving upwards, the solenoid will tend to create a magnetic field with the South pole downwards to PREVENT the magnet from cumming into him. Right Hand Grip rule, you point your thumb to the ceiling (up) and your fingers will wrap around anti-clockwise (when viewed from bird's eye view).

vv
Then you move your eyes away from your right hand and shoot it to the roof.

 

[Mr_Kap]

da fuk I still don't get why it's B

the current made in the coil generate a magnetic field such to oppose the magnet (lenz law), hence the magnetic field in the coil will be down (as the bottom of the coil needs to be south to oppose the south end of the magnet).

Due to the right hand CURL rule, the thumb faces to THE NORTH!!!! SO FACES UP!!!

Hence your finger curl anticlockwise

 

[DattMyball]

da fuk I still don't get why it's B

You can also use the curl rule on one of the wires (where thumb is current and fingers are field). If you look at the front wires, to make the field inside the coil where the magnet is be south at the bottom you point thumb right. You see the bit of fingers that would be in the middle of the coil going up north

 

[keepLooking]

Anyone care to explain why it is B?

What I thought was:

 

[atargainz]

the current made in the coil generate a magnetic field such to oppose the magnet (lenz law), hence the magnetic field in the coil will be down (as the bottom of the coil needs to be south to oppose the south end of the magnet).

Due to the right hand CURL rule, the thumb faces to THE NORTH!!!! SO FACES UP!!!

Hence your finger curl anticlockwise

Even if your thumb faces upwards, isn't it asking for the direction of the magnetic field which is always north --> south?

 

[Khan.Paki]

Wait I don't get it. If you put your thumb pointing upwards, don't your fingers still curl clockwise? So then how is it anti-clockwise?

 

[rowcache]

The alpha particle has twice the positive charge of the proton, and thus twice the force acting upon it. However, it has four times the mass so it is a=2/4=.5

@keepLooking