MCQ
1. An electric dipole of dipole moment p is placed parallel to a uniform electric field E . The work done in rotating the dipole by 180 degree is : a) pE b) 2pE c) -2pE d) Zero
2. A cylindrical copper conductor is stretched to increase its length by 10 % . The percentage increase in its resistance will be approximately a) 10 % b) 20 % c)21 % d) 5% (physics)
3. The magnetic susceptibility of a paramagnetic material is χ at a temperature T . If the temperature is doubled , its magnetic susceptibility becomes . a) 2χ b) 4 χ c) χ /2 d) χ
4. A copper wire of length L and area of cross section A carries a current I . If the wire is cut into two equal parts , the drift velocity of electrons under the same potential difference becomes : a) halved b)doubled c)quadrupled d) unchanged
5.
