Increasing the field or increasing the current will decrease the force on the conductor.

When a current carrying conductor is brought into magnetic field, the force that moves the conductor depends upon

A

The value of current

B

The weight of the conductor

C

The direction of the conductor

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

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

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

In the decade there has been significant decrease in coffee consumption.During this same time, there has been increasing publicity about the caffeine in coffee's adverse long term effects on health. Therefore, the decrease in coffee consumption must have been caused by consumer's awareness of the harmful caffeine. Which of the following, if true,most seriously calls into question the explanation above ?

A

On average,people consume 30% less coffee today than they did 10 years ago

B

Sales of specialty types of coffee have held steady as sales of regular brands have declined

C

The consumption of fruit juice and caffeine-free herbal tea has increased over the decade

D

Coffee prices increased steadily in the past decade because of unusually severs frosts in coffee-growing nation's.

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

Reversing the field or the current will reverse the force on the conductor.

A

Yes

B

No

A farmer has two rectangular fields. The larger 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

6k

C

7k

D

8k

A farmer has two rectangular 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

7K

C

8K

D

12K

Increasing the field or increasing the current will decrease the force on the conductor.

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