You are Here: Home

# Physics Q on Induction help needed watch

Announcements
1. All the possible answers from A to D seems to be true to me. Need help to know which is false. Thanks!
Question is attached.
Attached Images

2. D is false. at t=t2, the force is 0 (just like in C)
3. Can you share your explanation?
I though D is true. This is my reasoning, since I is a cosine curve and induced emf is proportional to the rate of change of flux linkage which implies induced emf is proptional to the rate of change of current in A, hence induced emf will follow a sine curve. Since at t=t2, I is zero for a cosine curve but will become max for a sine curve and should be max?

4. the force is proportional to the curent in one coil multiplied by the current in the other (just like gravitational force is proportional to the mass of one object multiplied by the mass of another object). so when either sin(t) =0 or cos(t)=0, the force will be 0, and at t=t2, sin(t) =0, therefore the force is 0, and not a maximum.
5. Thanks for your explanation. I got it.

TSR Support Team

We have a brilliant team of more than 60 Support Team members looking after discussions on The Student Room, helping to make it a fun, safe and useful place to hang out.

This forum is supported by:
Updated: March 19, 2004
Today on TSR

### Exam Jam 2018

Join thousands of students this half term

### Solo - A Star Wars Story

Poll
Useful resources

The Student Room, Get Revising and Marked by Teachers are trading names of The Student Room Group Ltd.

Register Number: 04666380 (England and Wales), VAT No. 806 8067 22 Registered Office: International House, Queens Road, Brighton, BN1 3XE