Question:
Choose the WRONG Statement from the following statements.
(A) A toroid is a solenoid bent in the form of a closed ring.
(B) The magnetic field lines of solenoid are straight lines parallel to the axis inside the solenoid.
(C) The magnetic field lines of toroid are circular having common centre.
(D) Inside a solenoid, magnetic field may be made strong by passing small current and using laminated coil of soft iron.
Choose the WRONG Statement from the following statements.
(A) A toroid is a solenoid bent in the form of a closed ring.
(B) The magnetic field lines of solenoid are straight lines parallel to the axis inside the solenoid.
(C) The magnetic field lines of toroid are circular having common centre.
(D) Inside a solenoid, magnetic field may be made strong by passing small current and using laminated coil of soft iron.
(A) A toroid is a solenoid bent in the form of a closed ring.
(B) The magnetic field lines of solenoid are straight lines parallel to the axis inside the solenoid.
(C) The magnetic field lines of toroid are circular having common centre.
(D) Inside a solenoid, magnetic field may be made strong by passing small current and using laminated coil of soft iron.
Show Hint
A strong field needs a large current and a soft iron core, so the statement claiming a small current is enough is the incorrect one.
Updated On: Nov 12, 2026
- D
- C
- B
- A
Show Solution
Verified By Collegedunia
The Correct Option is A
Solution and Explanation
Step 1: Understanding the Concept
We must pick the incorrect statement. Check each statement against the properties of a solenoid and toroid.
Step 2: Check the statements
(A) A toroid is a solenoid bent into a closed ring, which is true.
(B) Inside a solenoid the field lines are straight and parallel to the axis, which is true.
(C) Toroid field lines are concentric circles, which is true.
Step 3: Statement D
The field inside a solenoid is \(B=\mu_{0}nI\), so it is made strong by passing a large current and using a soft iron core. A small current does not give a strong field, so statement (D) is wrong.
Step 4: Compare the options
Statement (D) is the wrong one, which is listed as option (A).
Final Answer:
The wrong statement is statement D. \[ \boxed{\text{(A) }\text{D}} \]
We must pick the incorrect statement. Check each statement against the properties of a solenoid and toroid.
Step 2: Check the statements
(A) A toroid is a solenoid bent into a closed ring, which is true.
(B) Inside a solenoid the field lines are straight and parallel to the axis, which is true.
(C) Toroid field lines are concentric circles, which is true.
Step 3: Statement D
The field inside a solenoid is \(B=\mu_{0}nI\), so it is made strong by passing a large current and using a soft iron core. A small current does not give a strong field, so statement (D) is wrong.
Step 4: Compare the options
Statement (D) is the wrong one, which is listed as option (A).
Final Answer:
The wrong statement is statement D. \[ \boxed{\text{(A) }\text{D}} \]
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