Moving Charges and Magnetism Test

Result

Moving Charges and Magnetism Test - 9

Score
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Rank
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TIME Taken - -

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Weekly Quiz Competition

Question 1
1 / -0

A body can be negatively charged by

A
Removing some neutrons from it

B
Giving some protons to it

C
removing some electrons from it

D
Giving excess of electrons to it

Solution

Giving excess of electrons to it.
Question 2
1 / -0

A magnetic needle lying parallel to a magnetic field requires W units of work to turn it, through 60⁰. The torque needed to maintain the needle in this position will be

A
(√3W) / 2

B
W

C
2 W

D
√(3W)

Solution

the work done to turn a needle through an angle θ is W = mB cos θ

The torque needed to maintain τ = mBsin ⁡θ.

τ/W = tanθ.
τ = W tanθ = W tan60 = √3W