- A1.6 × 10–19 C
- B3.2 × 10–19 C
- C1.6 × 10–20 C
- D4.8 × 10–19 C
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Match the List I with the List II from the combination shown. In the left side (List I) there are four different conditions and in the right side (List II), there are ratios of heat produced in each resistance for each condition :
|
List I |
List II |
||
|
(I) |
Two wires of same resistance are connected in series and same current is passed through them |
(A) |
1 : 2 |
|
(II) |
Two wires of resistance R and 2R ohm are connected in series and same P.D. is applied across them |
(B) |
4 : 1 |
|
(III) |
Two wires of same resistance are connected in parallel and same current is flowing through them |
(C) |
1 : 1 |
|
(IV) |
Two wires of resistances in the ratio 1 : 2 are connected in parallel and same P.D. is applied across them |
(D) |
2 : 1 |
|
(a) I – B; II – A; III – C; IV - D |
(b) I – C; II – D; III – C; IV - D |
|
(c) I – B; II – D; III – A; IV - C |
(d) I – A; II – B; III – D; IV - C |
The electric field E, current density J and conductivity s of a conductor are related as
|
(a) σ = E/j |
(b) σ = j/E |
(c) σ = jE |
(d) σ = 1/jE |

An electron (mass = 9.1 kg; charge = 1.6
C) experiences no deflection if subjected to an electric field of 3.2
V/m, and a magnetic fields of 2.0
Wb/m2. Both the fields are normal to the path of electron and to each other. If the electric field is removed, then the electron will revolve in an orbit of radius
|
(a) 45 m |
(b) 4.5 m |
(c) 0.45 m |
(d) 0.045 m |