Physics-1996-Set III

[Only those questions and answers which are different from Set I have been given here.]

Q 2. If a rate of change of current of 3 A/s induces an e.m.f. of 30 mV in a solenoid,what is self-inductance of the solenoid ?(1 mark)
Ans 2. dI = 3A/S
dt
= 30 mv = 30 x 10-3
| | = L dI
dt
30 x 10-3 = L x 3 or L = 10-2 H.

Q 4. Name the device used for measuring the e.m.f. of a cell.
(1 mark)

Ans 4 Potentiometer is used for measuring the emf of a cell.

Q 5. What is the work done in moving a charge 40nC between two points on an equipotential surface ?(1 mark)
Ans 5 dw = q dv
on an equipotential surface dv = 0
dw = 0

Q 6. Two stars A and B have magnitudes +1 and -1 respectively.Which of these two appear less bright? (1mark)
Ans 6. Star with positive magnitude i.e,+1 will appear less bright

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