Related Questions

Hall effect is observed in a specimen (metal or semi conductor) when it is carrying current and is placed in a magnetic field. The resultant electric field inside the specimen is
A Normal to both current and magnetic field
B In the same direction as current
C In a direction anti parallel to magnetic field
D None of the above
A conductor of length L has current I passing through it, when it is placed parallel to a magnetic field. The force experienced by the conductor will be
A Zero
B BLI
C B2LI
D BLI2
Hall effect is observed in a specimen when it is carrying current and is placed in a magnetic field. The resultant electric field inside the specimen is
A Normal to both current and magnetic field
B In the direction of current
C Antiparallel to magnetic field
D In arbitrary direction
The length of a rectangular field F is 3 km greater than the side of a square field M , and the width of field F is 3 km less then the side of field M. If the area of field M is m2 square km, what is the area of field F?
A m2 +6
B 6
C m2 - 6
D m2 +9
Electron current is flowing through a conductor in a direction you might describe as straight into this page. What is the direction of the resulting magnetic field?
A Clockwise
B Counterclockwise
C Out of this page
D Into this page
E None of the above
A farmer has two rectangular fields. The larger field has twice the length and four times the width of the smaller field. If the smaller field has area K, then the area of the largest field is greater than the area of the smaller field by what amount?
A 4K
B 6K
C 7K
D 8K
A farmer has two rectangular fields. The larger field has twice the length and four times the width of the smaller field. If the smaller field has area K, then the area of the larger field is greater than the area of the smaller field by what amount ?
A 2K
B 5 K
C 6K
D 7K
A closely coiled helical spring is acted upon by an axial force. The maximum shear stress developed in the spring is $$\tau $$. The half of the length of the spring if cut off and the remaining spring is acted upon by the same axial force. The maximum shear stress in the spring in new condition will be
A $$\frac{\tau }{2}$$
B $$\tau $$
C $$2\tau $$
D $$4\tau $$
q পরিমাণ আধান একটি চৌম্বক ক্ষেত্র B→ এর সাথে সমান্তরালে V→ বেগে গতিশীল। উক্ত স্থানে একটি তড়িৎক্ষেত্র E→ থাকলে আধানের উপর ক্রিয়াশীল বল কত হবে? (A charge q moving with velocity V→ along the direction of a magnetic field B→ . If there is an electric field E→ in the same place then what will be the effective force on the charge q?)
A q(B→+V→×E→)
B q(B→+V→.E→)
C qE→
D q(E→+B→)
q পরিমাণ আধান একটি চৌম্বক ক্ষেত্র i এর সাথে সমান্তরালে বেগে গতিশীল। উক্ত স্থানে একটি তড়িৎক্ষেত্র থাকলে আধানের উপর ক্রিয়াশীল বল কত হবে? ( A charge moving with velocity along the direction of a magnetic field B. If there is an electric field E in the same place then what will be the effective force on the charge q?)
A qE→+v→×B→
B qE→+v→·B→
C qE→
D qE→+B→

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