7. If diameter of a conductor is doubled, the drift velocity of electrons inside it will [ ] a) Be doubled b) Be halved c) Not change - The dimensional formula of current density is d) Be thrice a) [LT-2] b) [ML-³] c) [L-2A] d) [L²A] . With the rise in temperature r.m. s velocity a) Decreases b) Increases

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Chapter22: Magnetism
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Problem 71PE: What current is needed in the top wire in Figure 22.58(a) to produce a field of zero at the point...
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7.
If diameter of a conductor is doubled, the drift velocity of electrons inside it will[ ]
a) Be doubled
b) Be halved
c) Not change
| The dimensional formula of current density is
d) Be thrice
a) [LT-2]
b) [ML-³]
c) [L-2A]
d) [L² A]
9. With the rise in temperature r.m.s velocity
a) Decreases
b) Increases
c) Doesn't change
d) may increase or decrease
10. With the rise in temperature, relaxation time
a) Increases
b) Decreases
c) Doesn't change
d) May increase or decrease
11. The unit of mobility
m
d) None
m2
a)
volt -sec
m
b)
volt -sec
c)
volt 2
L. When the electric field is zero drift velocity is
c) Zero
d) None
a) Maximum
b) Minimum
Transcribed Image Text:7. If diameter of a conductor is doubled, the drift velocity of electrons inside it will[ ] a) Be doubled b) Be halved c) Not change | The dimensional formula of current density is d) Be thrice a) [LT-2] b) [ML-³] c) [L-2A] d) [L² A] 9. With the rise in temperature r.m.s velocity a) Decreases b) Increases c) Doesn't change d) may increase or decrease 10. With the rise in temperature, relaxation time a) Increases b) Decreases c) Doesn't change d) May increase or decrease 11. The unit of mobility m d) None m2 a) volt -sec m b) volt -sec c) volt 2 L. When the electric field is zero drift velocity is c) Zero d) None a) Maximum b) Minimum
2. The direction of current density is same as that of
Y a) Current
b) Electric field
c) Electric potential d) Charge
3. Relation between drift velocity and current
I
a) V =-
b) V
c) J =
d) V = L
n
neA
A
пе
4. Drift velocity will be of the order
a) 10-6m/s
b) 10-3m/s
c) 10° m/s
d) 10' m/s
54
Transcribed Image Text:2. The direction of current density is same as that of Y a) Current b) Electric field c) Electric potential d) Charge 3. Relation between drift velocity and current I a) V =- b) V c) J = d) V = L n neA A пе 4. Drift velocity will be of the order a) 10-6m/s b) 10-3m/s c) 10° m/s d) 10' m/s 54
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