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• AIPMT 2010 Physics

AIPMT 2010 Physics

Q.1. Consider the following two statements:

1. Kirchhoff's junction law follows from the conservation of charge.
2. Kirchhoff's loop law follows from the conservation of energy

Which of the following is correct?

1. Both (A) and (B) are wrong
2. (A) is correct and (B) is wrong
3. (A) is wrong and (B) is correct
4. (4) Both (A) and (B) are correct

Sol:

Junction − conservation of charge Loop − conservation of energy

Answer: (4)

Q. 2. Electromagnets are made of soft iron because soft iron has:

1. low retentivity and high coercive force
2. high retentivity and high coercive force
3. low retentivity and low coercive force
4. high retentivity and low coercive force

Answer : (4)

Q. 3.  A series combination of n₁ capacitors, each of value C₁, is charged by a source of
potential difference 4 V. When another parallel combination of n₂ capacitors, each
of value C₂, is charged by a source of potential difference V, it has the same (total)
energy stored in it, as the first combination has. The value of C₂, in terms of C₁, is then:

Sol: 

Answer : (4)