Question 21 : When the length of the conductor in the current carrying conductor increases, what happens to the force in the conductor which is at right angles to the magnetic field?
1. Increases
2. Decreases
3. Remains the same
4. Becomes zero
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Question 22 : When the current in the current carrying conductor increases, what happens to the force in the conductor which is at right angles to the magnetic field?
1. Increases
2. Decreases
3. Remains the same
4. Becomes zero
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Question 23 : Which among the following, is the correct expression for force in a current carrying conductor if magnetic field is perpendicular to it?
1. F=Bi
2. F=B²il
3. F=Bil
4. F=Bl²
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Question 24 : The relation between the direction of current and the direction of the force is ________
1. Same direction
2. Opposite direction
3. Perpendicular
4. Unrelated
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Question 25 : The relation between the direction of force and the direction of magnetic field is __________
1. Same direction
2. Opposite direction
3. Perpendicular
4. Unrelated
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Question 26 : Weakest force in nature is __________
1. Electric force
2. Gravitational force
3. Weak force
4. Magnetic force
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Question 27 : The ratio of magnetic force to electric force on a charged particle getting undeflected in a field is ______
1. 1
2. 0
3. 2
4. 4
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Question 28 : If the flow of electric current is parallel to the magnetic field, the force will be?
1. Zero
2. Infinity
3. Maximum
4. Half the original value
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Question 29 : Calculate the force between two charges having magnitude 3nC and 2nC separated by a distance of 2micro m.
1. 13.5N
2. 13.5kN
3. 1.35N
4. 1.35kN
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Question 30 : Force in a conductor is __________ to the square of the distance between the charges.
1. Directly proportional
2. Inversely proportional
3. Not related
4. Cannot be determined
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