All India Engineering / Architecture Entrance Examination (AIEEE)

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AIEEE 2007 Physics

Q. 5. An ideal coil of 10 H is connected in series with a resistance of and a battery of 5V. 2 seconds after the connection is made, the current flowing in amperes in the circuit is

1. (1 - e)
2. e
3. 
4. 

Sol:
Correct choice: (4)

Q. 6. A long straight wire of radius a carries a steady current i. The current is uniformly distributed across its cross section. The ratio of the magnetic field at and 2a is

1. 
2. 4
3. 1
4. 

Sol:

Correct choice: (3)

Q. 7. A current I flows along the length of an infinitely long, straight, thin walled pipe. Then

1. the magnetic field is zero only on the axis of the pipe
2. the magnetic field is different at different points inside the pipe
3. the magnetic field at any point inside the pipe is zero
4. the magnetic field at all points inside the pipe is the same, but not zer

Sol: Magnetic field inside the infinitely long pipe is zero at all points. Correct choice: (3)

Q. 8. If is the mass of an oxygen isotope , are the masses of a proton and a neutron respectively, the nuclear binding energy of the isotope is

Sol: Nuclear binding energy

Correct choice: (2)